A sofa regularly sells for $790. The sale price is $624.10. How do you find the percent decrease of the sale price from the regular price?

2 Answers
EZ as pi
Nov 20, 2016

#21%# decrease in price.

Explanation:

To calculate the percent change in any situation:
increase, decrease, profit, mark-up, discount, loss, growth, decline, etc..

Use the method:

#% " change " = "amount of change"/"original amount" xx100%#

The price of the sofa changed from #$790 " to " $624.10#

This is an amount of #$165.90#

#165.90/790 xx 100%#

=#21%# decrease in price

smendyka
Nov 20, 2016

There was a -21% change or a 21% decrease of the sale price from the regular price.

Explanation:

The formula for calculating the percentage change of something is #p = (N - O)/O * 100# where #p# is the percentage change, #N# is the new value and #O# is the old value.

In this problem we are provided the old value of $790 and the new value of $624.10 which we can substitute into the formula to calculate the percentage change:

#p = (624.10 - 790)/790 * 100#

#p = -165.9/790*100#

#p = -16590/790#

#p = -21#

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