21.45% is the change from 429 to 521
Calculation steps:
[( 521 - 429 ) ÷ 429] x 100 = 21.45%
Formula
Percentage change = [(521 - 429) / 429] x 100
Subtract the new number by the original number
521 - 429 = 92
92 ÷ 429 = 0.21445221445221446
0.21445221445221446 x 100 = 21.45%