62.7% is the change from 504 to 820
Calculation steps:
[( 820 - 504 ) ÷ 504] x 100 = 62.7%
Formula
Percentage change = [(820 - 504) / 504] x 100
Subtract the new number by the original number
820 - 504 = 316
316 ÷ 504 = 0.626984126984127
0.626984126984127 x 100 = 62.7%