842.5% is the change from 40 to 377
Calculation steps:
[( 377 - 40 ) ÷ 40] x 100 = 842.5%
Formula
Percentage change = [(377 - 40) / 40] x 100
Subtract the new number by the original number
377 - 40 = 337
337 ÷ 40 = 8.425
8.425 x 100 = 842.5%
Example