2587.5% is the change from 24 to 645
Calculation steps:
[( 645 - 24 ) ÷ 24] x 100 = 2587.5%
Formula
Percentage change = [(645 - 24) / 24] x 100
Subtract the new number by the original number
645 - 24 = 621
621 ÷ 24 = 25.875
25.875 x 100 = 2587.5%
Example