29.93% is the change from 401 to 521
Calculation steps:
[( 521 - 401 ) ÷ 401] x 100 = 29.93%
Formula
Percentage change = [(521 - 401) / 401] x 100
Subtract the new number by the original number
521 - 401 = 120
120 ÷ 401 = 0.29925187032418954
0.29925187032418954 x 100 = 29.93%