-49.22% is the change from 831 to 422
Calculation steps:
[( 422 - 831 ) ÷ 831] x 100 = -49.22%
Formula
Percentage change = [(422 - 831) / 831] x 100
Subtract the new number by the original number
422 - 831 = -409
-409 ÷ 831 = -0.49217809867629364
-0.49217809867629364 x 100 = -49.22%