81.79% is the change from 390 to 709
Calculation steps:
[( 709 - 390 ) ÷ 390] x 100 = 81.79%
Formula
Percentage change = [(709 - 390) / 390] x 100
Subtract the new number by the original number
709 - 390 = 319
319 ÷ 390 = 0.8179487179487179
0.8179487179487179 x 100 = 81.79%