63.35% is the change from 502 to 820
Calculation steps:
[( 820 - 502 ) ÷ 502] x 100 = 63.35%
Formula
Percentage change = [(820 - 502) / 502] x 100
Subtract the new number by the original number
820 - 502 = 318
318 ÷ 502 = 0.6334661354581673
0.6334661354581673 x 100 = 63.35%