1700% is the change from 40 to 720
Calculation steps:
[( 720 - 40 ) ÷ 40] x 100 = 1700%
Formula
Percentage change = [(720 - 40) / 40] x 100
Subtract the new number by the original number
720 - 40 = 680
680 ÷ 40 = 17
17 x 100 = 1700%
Example