2540% is the change from 20 to 528
Calculation steps:
[( 528 - 20 ) ÷ 20] x 100 = 2540%
Formula
Percentage change = [(528 - 20) / 20] x 100
Subtract the new number by the original number
528 - 20 = 508
508 ÷ 20 = 25.4
25.4 x 100 = 2540%
Example