2100% is the change from 24 to 528
Calculation steps:
[( 528 - 24 ) ÷ 24] x 100 = 2100%
Formula
Percentage change = [(528 - 24) / 24] x 100
Subtract the new number by the original number
528 - 24 = 504
504 ÷ 24 = 21
21 x 100 = 2100%
Example