76.92% is the change from 390 to 690
Calculation steps:
[( 690 - 390 ) ÷ 390] x 100 = 76.92%
Formula
Percentage change = [(690 - 390) / 390] x 100
Subtract the new number by the original number
690 - 390 = 300
300 ÷ 390 = 0.7692307692307693
0.7692307692307693 x 100 = 76.92%