91.38% is the change from 429 to 821
Calculation steps:
[( 821 - 429 ) ÷ 429] x 100 = 91.38%
Formula
Percentage change = [(821 - 429) / 429] x 100
Subtract the new number by the original number
821 - 429 = 392
392 ÷ 429 = 0.9137529137529138
0.9137529137529138 x 100 = 91.38%