108.91% is the change from 393 to 821
Calculation steps:
[( 821 - 393 ) ÷ 393] x 100 = 108.91%
Formula
Percentage change = [(821 - 393) / 393] x 100
Subtract the new number by the original number
821 - 393 = 428
428 ÷ 393 = 1.089058524173028
1.089058524173028 x 100 = 108.91%