81.43% is the change from 307 to 557
Calculation steps:
[( 557 - 307 ) ÷ 307] x 100 = 81.43%
Formula
Percentage change = [(557 - 307) / 307] x 100
Subtract the new number by the original number
557 - 307 = 250
250 ÷ 307 = 0.8143322475570033
0.8143322475570033 x 100 = 81.43%