66.19% is the change from 494 to 821
Calculation steps:
[( 821 - 494 ) ÷ 494] x 100 = 66.19%
Formula
Percentage change = [(821 - 494) / 494] x 100
Subtract the new number by the original number
821 - 494 = 327
327 ÷ 494 = 0.6619433198380567
0.6619433198380567 x 100 = 66.19%