1517.5% is the change from 40 to 647
Calculation steps:
[( 647 - 40 ) ÷ 40] x 100 = 1517.5%
Formula
Percentage change = [(647 - 40) / 40] x 100
Subtract the new number by the original number
647 - 40 = 607
607 ÷ 40 = 15.175
15.175 x 100 = 1517.5%
Example