-48.5% is the change from 831 to 428
Calculation steps:
[( 428 - 831 ) ÷ 831] x 100 = -48.5%
Formula
Percentage change = [(428 - 831) / 831] x 100
Subtract the new number by the original number
428 - 831 = -403
-403 ÷ 831 = -0.48495788206979545
-0.48495788206979545 x 100 = -48.5%