A backpack that normally sells for $39 is on sale for 33% off. How do you find the amount of the discount and the sale price?

1 Answer
Oct 28, 2016

Answer:

The amount of the discount is $12.87 and the sale price is $26.13

Explanation:

The formula for the percent increase of decrease of something is #p = (N - O)/O * 100# where #p# is the percent change, #N# is the new price and #O# is the old price. Substituting what we know gives:

#-33 = (N - 39)/39 * 100#

Solving for N gives:

#-33/100 = (N - 39)/39#

#(39 * -33) /100 = N - 39#

#-1287/100 = N - 39#

#-12.87 + 39 = N#

#N = 26.13#