68.21% is the change from 390 to 656
Calculation steps:
[( 656 - 390 ) ÷ 390] x 100 = 68.21%
Formula
Percentage change = [(656 - 390) / 390] x 100
Subtract the new number by the original number
656 - 390 = 266
266 ÷ 390 = 0.6820512820512821
0.6820512820512821 x 100 = 68.21%