64.99% is the change from 497 to 820
Calculation steps:
[( 820 - 497 ) ÷ 497] x 100 = 64.99%
Formula
Percentage change = [(820 - 497) / 497] x 100
Subtract the new number by the original number
820 - 497 = 323
323 ÷ 497 = 0.6498993963782697
0.6498993963782697 x 100 = 64.99%