-49.7% is the change from 831 to 418
Calculation steps:
[( 418 - 831 ) ÷ 831] x 100 = -49.7%
Formula
Percentage change = [(418 - 831) / 831] x 100
Subtract the new number by the original number
418 - 831 = -413
-413 ÷ 831 = -0.4969915764139591
-0.4969915764139591 x 100 = -49.7%