115.13% is the change from 390 to 839
Calculation steps:
[( 839 - 390 ) ÷ 390] x 100 = 115.13%
Formula
Percentage change = [(839 - 390) / 390] x 100
Subtract the new number by the original number
839 - 390 = 449
449 ÷ 390 = 1.1512820512820512
1.1512820512820512 x 100 = 115.13%