Question

suppose the original quantity is $30 and the new quantity is $39. estimate the percent change. is this an example of a percent increase or a percent decrease?

Answer 1

original quantity = $30

New quantity = $39

increase amount = 39-30 = 9

Percent change:

30 x = 9

x = 9/30

x = 0.3

0.3x 100 = 30%

Since the quantity grows, it's a percent increase.