917.5% is the change from 40 to 407
Calculation steps:
[( 407 - 40 ) ÷ 40] x 100 = 917.5%
Formula
Percentage change = [(407 - 40) / 40] x 100
Subtract the new number by the original number
407 - 40 = 367
367 ÷ 40 = 9.175
9.175 x 100 = 917.5%
Example