23.46% is the change from 422 to 521
Calculation steps:
[( 521 - 422 ) ÷ 422] x 100 = 23.46%
Formula
Percentage change = [(521 - 422) / 422] x 100
Subtract the new number by the original number
521 - 422 = 99
99 ÷ 422 = 0.23459715639810427
0.23459715639810427 x 100 = 23.46%