31.03% is the change from 290 to 380
Calculation steps:
[( 380 - 290 ) ÷ 290] x 100 = 31.03%
Formula
Percentage change = [(380 - 290) / 290] x 100
Subtract the new number by the original number
380 - 290 = 90
90 ÷ 290 = 0.3103448275862069
0.3103448275862069 x 100 = 31.03%