1397.5% is the change from 40 to 599
Calculation steps:
[( 599 - 40 ) ÷ 40] x 100 = 1397.5%
Formula
Percentage change = [(599 - 40) / 40] x 100
Subtract the new number by the original number
599 - 40 = 559
559 ÷ 40 = 13.975
13.975 x 100 = 1397.5%
Example