73.52% is the change from 321 to 557
Calculation steps:
[( 557 - 321 ) ÷ 321] x 100 = 73.52%
Formula
Percentage change = [(557 - 321) / 321] x 100
Subtract the new number by the original number
557 - 321 = 236
236 ÷ 321 = 0.735202492211838
0.735202492211838 x 100 = 73.52%