110.51% is the change from 390 to 821
Calculation steps:
[( 821 - 390 ) ÷ 390] x 100 = 110.51%
Formula
Percentage change = [(821 - 390) / 390] x 100
Subtract the new number by the original number
821 - 390 = 431
431 ÷ 390 = 1.1051282051282052
1.1051282051282052 x 100 = 110.51%