250% is the change from 24 to 84
Calculation steps:
[( 84 - 24 ) ÷ 24] x 100 = 250%
Formula
Percentage change = [(84 - 24) / 24] x 100
Subtract the new number by the original number
84 - 24 = 60
60 ÷ 24 = 2.5
2.5 x 100 = 250%
Example