91.82% is the change from 428 to 821
Calculation steps:
[( 821 - 428 ) ÷ 428] x 100 = 91.82%
Formula
Percentage change = [(821 - 428) / 428] x 100
Subtract the new number by the original number
821 - 428 = 393
393 ÷ 428 = 0.9182242990654206
0.9182242990654206 x 100 = 91.82%