20% is the change from 20 to 24
Calculation steps:
[( 24 - 20 ) ÷ 20] x 100 = 20%
Formula
Percentage change = [(24 - 20) / 20] x 100
Subtract the new number by the original number
24 - 20 = 4
4 ÷ 20 = 0.2
0.2 x 100 = 20%
Example