67.21% is the change from 491 to 821
Calculation steps:
[( 821 - 491 ) ÷ 491] x 100 = 67.21%
Formula
Percentage change = [(821 - 491) / 491] x 100
Subtract the new number by the original number
821 - 491 = 330
330 ÷ 491 = 0.6720977596741344
0.6720977596741344 x 100 = 67.21%