1600% is the change from 40 to 680
Calculation steps:
[( 680 - 40 ) ÷ 40] x 100 = 1600%
Formula
Percentage change = [(680 - 40) / 40] x 100
Subtract the new number by the original number
680 - 40 = 640
640 ÷ 40 = 16
16 x 100 = 1600%
Example