34.48% is the change from 290 to 390
Calculation steps:
[( 390 - 290 ) ÷ 290] x 100 = 34.48%
Formula
Percentage change = [(390 - 290) / 290] x 100
Subtract the new number by the original number
390 - 290 = 100
100 ÷ 290 = 0.3448275862068966
0.3448275862068966 x 100 = 34.48%