830% is the change from 40 to 372
Calculation steps:
[( 372 - 40 ) ÷ 40] x 100 = 830%
Formula
Percentage change = [(372 - 40) / 40] x 100
Subtract the new number by the original number
372 - 40 = 332
332 ÷ 40 = 8.3
8.3 x 100 = 830%
Example