21.62% is the change from 421 to 512
Calculation steps:
[( 512 - 421 ) ÷ 421] x 100 = 21.62%
Formula
Percentage change = [(512 - 421) / 421] x 100
Subtract the new number by the original number
512 - 421 = 91
91 ÷ 421 = 0.2161520190023753
0.2161520190023753 x 100 = 21.62%