How To Calculate Percentage Decrease (With Examples)

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  2. How To Calculate Percentage Decrease (With Examples)

How To Calculate Percentage Decrease (With Examples)

By indeed Editorial Team

October 28, 2021TwitterLinkedInFacebookEmail Calculating share decrease can help determine the potency of money-saving measures such as promotional rates or making comparisons. While it does require some arithmetic, the steps are coherent between problems. In this article, we guide you through the steps to calculate percentage decrease or find a modern respect when given a starting respect and the percentage decrease. Related : How To Calculate percentage Key takeaways

  • share change can be applied to any measure measured over time .
  • share decrease is the percentage switch in a prize compared to its initial value .
  • percentage decrease represents a personnel casualty of value from the original quantity .


What is percentage decrease?

share decrease is the deviation between starting and ending values. It shows a passing of value from the original expressed as a share careless of units. The measure of decrease is the master amount minus the final amount. For case, if you spent $ 200 to heat your home last month, but only $ 140 this month, the cost has decreased by $ 60. Expressed as a percentage decrease, you can conclude the cost of heating your home has decreased by 30 % .

How to calculate percentage decrease

Use these steps and formula to calculate percentage decrease : percentage decrease = ( starting value – ending value ) /starting prize x 100

  1. Determine the starting value and ending prize.
    For example, Joe is considering changing jobs. He works for a ship’s company making $ 22.75 per hour. He has been offered a position airless to home that pays $ 20.50 per hour. To find the percentage decrease in pay :
  2. Subtract the ending value from the starting value.
    *Using the exemplar above, subtract the newfangled pace of pay from the original rate of pay. $ 22.50 – $ 20.20 = $ 2.25*
  3. Divide this act by the starting value.
    *Divide this number, the dispute between rates of pay, by the original rate of yield. $ 2.25 / $ 22.50 = .1*
  4. Multiply by 100 to find the percentage change ( note : if the share is a negative, this means the percentage switch is positive. )
    *Multiply this number by 100 to determine the share decrease. .1 adam 100 = 10 % decrease*

If Jose takes the new job, his give would decrease by 10 %. Read more : How To Calculate Growth Percentage

Examples of how to calculate percentage decrease

The watch examples show how to solve for percentage decrease when given a get down and ending prize :

Example 1

Brenda scored an 87 on her first biology test and an 82 on her moment biology screen. To find the percentage decrease between examination scores :

  1. *Subtract the raw test score from the previous test score. 87 – 82 = 5*
  2. *Divide the deviation of the two scores by the master test score. 5 / 87 = .057 ( rounded ) *
  3. *Multiply this numeral by 100 to determine the share decrease. .057 ten 100 = 5.7 % *

The pace of percentage decrease between Brenda ‘s test scores was 5.7 % .

Example 2

Dianne averaged 70 miles per hour tug to St. Petersburg. On the return trip during rush hour, she averaged 54 miles per hour. To find the share decrease in her rate of travel :

  1. *Subtract the modern rate of travel from the original rate of travel. 70 miles per hour – 54 miles per hour = 16 mph*
  2. *Divide this deviation by the original rate of change of location. 16mph / 70mph = .229 ( rounded ) *
  3. *Multiply this quotient by 100 to determine the decrease as a share. .229 ten 100 = 22.9 % *

The decrease in the rate of travel between trips was 22.9 %. Dianne traveled 22.9 % more lento on her second travel .

Example 3

If the results indicate a negative share decrease, this means the rate of exchange is positive. This is most probably to occur as a leave of misunderstanding the trouble. When calculating for a rate of decrease between an original cost of $ 75 and a new cost of $ 80 :

  1. *Subtract the second cost from the master cost. $ 75 – $ 80 = – $ 5*
  2. *Divide the dispute by the master price. -5 / 75 = -.067*
  3. *Multiply by 100 to express the number as a percentage. -.067 adam 100 = -6.7 % *
  4. Recognize the negative means that the answer is the antonym of a rate of decrease. alternatively, it expresses a pace of increase .

In this case, the pace of cost addition is 6.7 % .

How to calculate value based on percentage decrease

Use the following steps and formula to calculate value based on percentage decrease : New value = original measure – ( share decrease/100 x original value ) You may know the share decrease and the starting rate but want to find the ending rate. For exercise, you might consider paying a service fee of $ 9.75 per month for a stream service running a promotion of a 20 % discount for one month. The discount rate would be $ 7.80 for the foremost calendar month. hera ‘s how to calculate this :

  1. Convert the percentage decrease into a decimal by dividing by 100 .
  2. Multiply the resulting decimal fraction by the starting value .
  3. subtract this value from the starting value .
  4. This is the fresh rate based on the given percentage decrease .

a lot like in the former examples, the most common errors involve arithmetic. In the case of calculating value based on share decrease, the most common is forgetting to subtract the variety in rate from the master .

Examples of how to calculate value based on percentage decrease

The postdate examples include the steps to finding a new measure when given a starting value and the percentage decrease :

Example 1

crystal uses a dwelling clean service that charges $ 125 per chew the fat. She receives a coupon for 30 % off her next home clean. To find the cost of her future base clean :

  1. *Convert the percentage decrease into a decimal by dividing by 100. 30 % / 100 = .30*
  2. *Multiply the master price by the decrease to find the rate of the deduction. .30 ten $ 125 = $ 37.50*
  3. *Subtract the value of the discount from the original cost. $ 125.00 – $ 37.50 = $ 87.50*

By using the percentage decrease, the cost of Crystal ‘s future home clean is $ 87.50 and, far, her savings is $ 37.50 .

Example 2

Deondre pays $ 114 per month for his cell earphone. He sees an ad that a cellular provider will beat his existing monthly rate by 25 %. To find the fresh supplier ‘s rate :

  1. *Convert the percentage decrease into decimal shape by dividing by 100. 25 % / 100 = .25*
  2. *Multiply this decimal by the master monetary value to determine the dismiss rate. $ 114 x .25 = $ 28.50*
  3. *Subtract the deduction from the master cost to determine the new rate. $ 114.00 – $ 28.50 = $ 85.50*

Deondre ‘s new rate will be $ 85.50 per month. His save is $ 28.50 per calendar month .

Example 3

One year ago, Andrea bought a new cable car for $ 21,350. Her accountant tells her it has lost 17 % of its value since then. To find the value of Andrea ‘s cable car now :

  1. *Convert the share decrease into decimal form by dividing by 100. 17 % / 100 = .17*
  2. *To determine the loss of measure reproduce this decimal by the original price. $ 21,350 x .17 = $ 3,629.50*
  3. *Subtract the loss of value from the original value. $ 21,350 – $ 3,629.50 = $ 17,720.50*

Andrea ‘s car is now worth $ 17,720.50. Her car lost $ 3,629.50 in respect, or depreciated, over the first class.

Related : What Is percentage Increase Formula ? ( With Examples and Formulas )

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