21.5% is the change from 428 to 520
Calculation steps:
[( 520 - 428 ) ÷ 428] x 100 = 21.5%
Formula
Percentage change = [(520 - 428) / 428] x 100
Subtract the new number by the original number
520 - 428 = 92
92 ÷ 428 = 0.21495327102803738
0.21495327102803738 x 100 = 21.5%