750% is the change from 20 to 170
Calculation steps:
[( 170 - 20 ) ÷ 20] x 100 = 750%
Formula
Percentage change = [(170 - 20) / 20] x 100
Subtract the new number by the original number
170 - 20 = 150
150 ÷ 20 = 7.5
7.5 x 100 = 750%
Example