240% is the change from 20 to 68
Calculation steps:
[( 68 - 20 ) ÷ 20] x 100 = 240%
Formula
Percentage change = [(68 - 20) / 20] x 100
Subtract the new number by the original number
68 - 20 = 48
48 ÷ 20 = 2.4
2.4 x 100 = 240%
Example