105.76% is the change from 399 to 821
Calculation steps:
[( 821 - 399 ) ÷ 399] x 100 = 105.76%
Formula
Percentage change = [(821 - 399) / 399] x 100
Subtract the new number by the original number
821 - 399 = 422
422 ÷ 399 = 1.0576441102756893
1.0576441102756893 x 100 = 105.76%