50.81% is the change from 557 to 840
Calculation steps:
[( 840 - 557 ) ÷ 557] x 100 = 50.81%
Formula
Percentage change = [(840 - 557) / 557] x 100
Subtract the new number by the original number
840 - 557 = 283
283 ÷ 557 = 0.5080789946140036
0.5080789946140036 x 100 = 50.81%