97.21% is the change from 502 to 990
Calculation steps:
[( 990 - 502 ) ÷ 502] x 100 = 97.21%
Formula
Percentage change = [(990 - 502) / 502] x 100
Subtract the new number by the original number
990 - 502 = 488
488 ÷ 502 = 0.9721115537848606
0.9721115537848606 x 100 = 97.21%