68.28% is the change from 331 to 557
Calculation steps:
[( 557 - 331 ) ÷ 331] x 100 = 68.28%
Formula
Percentage change = [(557 - 331) / 331] x 100
Subtract the new number by the original number
557 - 331 = 226
226 ÷ 331 = 0.6827794561933535
0.6827794561933535 x 100 = 68.28%