65.34% is the change from 502 to 830
Calculation steps:
[( 830 - 502 ) ÷ 502] x 100 = 65.34%
Formula
Percentage change = [(830 - 502) / 502] x 100
Subtract the new number by the original number
830 - 502 = 328
328 ÷ 502 = 0.6533864541832669
0.6533864541832669 x 100 = 65.34%