237.5% is the change from 24 to 81
Calculation steps:
[( 81 - 24 ) ÷ 24] x 100 = 237.5%
Formula
Percentage change = [(81 - 24) / 24] x 100
Subtract the new number by the original number
81 - 24 = 57
57 ÷ 24 = 2.375
2.375 x 100 = 237.5%
Example