66.93% is the change from 254 to 424
Calculation steps:
[( 424 - 254 ) ÷ 254] x 100 = 66.93%
Formula
Percentage change = [(424 - 254) / 254] x 100
Subtract the new number by the original number
424 - 254 = 170
170 ÷ 254 = 0.6692913385826772
0.6692913385826772 x 100 = 66.93%