74.06% is the change from 320 to 557
Calculation steps:
[( 557 - 320 ) ÷ 320] x 100 = 74.06%
Formula
Percentage change = [(557 - 320) / 320] x 100
Subtract the new number by the original number
557 - 320 = 237
237 ÷ 320 = 0.740625
0.740625 x 100 = 74.06%