112.5% is the change from 80 to 170
Calculation steps:
[( 170 - 80 ) ÷ 80] x 100 = 112.5%
Formula
Percentage change = [(170 - 80) / 80] x 100
Subtract the new number by the original number
170 - 80 = 90
90 ÷ 80 = 1.125
1.125 x 100 = 112.5%
Example