76.41% is the change from 390 to 688
Calculation steps:
[( 688 - 390 ) ÷ 390] x 100 = 76.41%
Formula
Percentage change = [(688 - 390) / 390] x 100
Subtract the new number by the original number
688 - 390 = 298
298 ÷ 390 = 0.764102564102564
0.764102564102564 x 100 = 76.41%