51.21% is the change from 621 to 939
Calculation steps:
[( 939 - 621 ) ÷ 621] x 100 = 51.21%
Formula
Percentage change = [(939 - 621) / 621] x 100
Subtract the new number by the original number
939 - 621 = 318
318 ÷ 621 = 0.5120772946859904
0.5120772946859904 x 100 = 51.21%