20.55% is the change from 438 to 528
Calculation steps:
[( 528 - 438 ) ÷ 438] x 100 = 20.55%
Formula
Percentage change = [(528 - 438) / 438] x 100
Subtract the new number by the original number
528 - 438 = 90
90 ÷ 438 = 0.2054794520547945
0.2054794520547945 x 100 = 20.55%