22.84% is the change from 521 to 640
Calculation steps:
[( 640 - 521 ) ÷ 521] x 100 = 22.84%
Formula
Percentage change = [(640 - 521) / 521] x 100
Subtract the new number by the original number
640 - 521 = 119
119 ÷ 521 = 0.22840690978886757
0.22840690978886757 x 100 = 22.84%