120% is the change from 390 to 858
Calculation steps:
[( 858 - 390 ) ÷ 390] x 100 = 120%
Formula
Percentage change = [(858 - 390) / 390] x 100
Subtract the new number by the original number
858 - 390 = 468
468 ÷ 390 = 1.2
1.2 x 100 = 120%
Example