342.86% is the change from 7 to 31
Calculation steps:
[( 31 - 7 ) ÷ 7] x 100 = 342.86%
Formula
Percentage change = [(31 - 7) / 7] x 100
Subtract the new number by the original number
31 - 7 = 24
24 ÷ 7 = 3.4285714285714284
3.4285714285714284 x 100 = 342.86%