21.88% is the change from 521 to 635
Calculation steps:
[( 635 - 521 ) ÷ 521] x 100 = 21.88%
Formula
Percentage change = [(635 - 521) / 521] x 100
Subtract the new number by the original number
635 - 521 = 114
114 ÷ 521 = 0.21880998080614203
0.21880998080614203 x 100 = 21.88%