880% is the change from 40 to 392
Calculation steps:
[( 392 - 40 ) ÷ 40] x 100 = 880%
Formula
Percentage change = [(392 - 40) / 40] x 100
Subtract the new number by the original number
392 - 40 = 352
352 ÷ 40 = 8.8
8.8 x 100 = 880%
Example