49.19% is the change from 557 to 831
Calculation steps:
[( 831 - 557 ) ÷ 557] x 100 = 49.19%
Formula
Percentage change = [(831 - 557) / 557] x 100
Subtract the new number by the original number
831 - 557 = 274
274 ÷ 557 = 0.4919210053859964
0.4919210053859964 x 100 = 49.19%