21.16% is the change from 430 to 521
Calculation steps:
[( 521 - 430 ) ÷ 430] x 100 = 21.16%
Formula
Percentage change = [(521 - 430) / 430] x 100
Subtract the new number by the original number
521 - 430 = 91
91 ÷ 430 = 0.2116279069767442
0.2116279069767442 x 100 = 21.16%