1510% is the change from 40 to 644
Calculation steps:
[( 644 - 40 ) ÷ 40] x 100 = 1510%
Formula
Percentage change = [(644 - 40) / 40] x 100
Subtract the new number by the original number
644 - 40 = 604
604 ÷ 40 = 15.1
15.1 x 100 = 1510%
Example