66.25% is the change from 240 to 399
Calculation steps:
[( 399 - 240 ) ÷ 240] x 100 = 66.25%
Formula
Percentage change = [(399 - 240) / 240] x 100
Subtract the new number by the original number
399 - 240 = 159
159 ÷ 240 = 0.6625
0.6625 x 100 = 66.25%