20.88% is the change from 431 to 521
Calculation steps:
[( 521 - 431 ) ÷ 431] x 100 = 20.88%
Formula
Percentage change = [(521 - 431) / 431] x 100
Subtract the new number by the original number
521 - 431 = 90
90 ÷ 431 = 0.2088167053364269
0.2088167053364269 x 100 = 20.88%