277.78% is the change from 18 to 68
Calculation steps:
[( 68 - 18 ) ÷ 18] x 100 = 277.78%
Formula
Percentage change = [(68 - 18) / 18] x 100
Subtract the new number by the original number
68 - 18 = 50
50 ÷ 18 = 2.7777777777777777
2.7777777777777777 x 100 = 277.78%