1242.5% is the change from 40 to 537
Calculation steps:
[( 537 - 40 ) ÷ 40] x 100 = 1242.5%
Formula
Percentage change = [(537 - 40) / 40] x 100
Subtract the new number by the original number
537 - 40 = 497
497 ÷ 40 = 12.425
12.425 x 100 = 1242.5%
Example