343.18% is the change from 88 to 390
Calculation steps:
[( 390 - 88 ) ÷ 88] x 100 = 343.18%
Formula
Percentage change = [(390 - 88) / 88] x 100
Subtract the new number by the original number
390 - 88 = 302
302 ÷ 88 = 3.4318181818181817
3.4318181818181817 x 100 = 343.18%