94.09% is the change from 423 to 821
Calculation steps:
[( 821 - 423 ) ÷ 423] x 100 = 94.09%
Formula
Percentage change = [(821 - 423) / 423] x 100
Subtract the new number by the original number
821 - 423 = 398
398 ÷ 423 = 0.9408983451536643
0.9408983451536643 x 100 = 94.09%