67.01% is the change from 491 to 820
Calculation steps:
[( 820 - 491 ) ÷ 491] x 100 = 67.01%
Formula
Percentage change = [(820 - 491) / 491] x 100
Subtract the new number by the original number
820 - 491 = 329
329 ÷ 491 = 0.670061099796334
0.670061099796334 x 100 = 67.01%