115% is the change from 80 to 172
Calculation steps:
[( 172 - 80 ) ÷ 80] x 100 = 115%
Formula
Percentage change = [(172 - 80) / 80] x 100
Subtract the new number by the original number
172 - 80 = 92
92 ÷ 80 = 1.15
1.15 x 100 = 115%
Example