915% is the change from 40 to 406
Calculation steps:
[( 406 - 40 ) ÷ 40] x 100 = 915%
Formula
Percentage change = [(406 - 40) / 40] x 100
Subtract the new number by the original number
406 - 40 = 366
366 ÷ 40 = 9.15
9.15 x 100 = 915%
Example