-91.38% is the change from 348 to 30
Calculation steps:
[( 30 - 348 ) ÷ 348] x 100 = -91.38%
Formula
Percentage change = [(30 - 348) / 348] x 100
Subtract the new number by the original number
30 - 348 = -318
-318 ÷ 348 = -0.9137931034482759
-0.9137931034482759 x 100 = -91.38%