325% is the change from 40 to 170
Calculation steps:
[( 170 - 40 ) ÷ 40] x 100 = 325%
Formula
Percentage change = [(170 - 40) / 40] x 100
Subtract the new number by the original number
170 - 40 = 130
130 ÷ 40 = 3.25
3.25 x 100 = 325%
Example