-91.35% is the change from 347 to 30
Calculation steps:
[( 30 - 347 ) ÷ 347] x 100 = -91.35%
Formula
Percentage change = [(30 - 347) / 347] x 100
Subtract the new number by the original number
30 - 347 = -317
-317 ÷ 347 = -0.9135446685878963
-0.9135446685878963 x 100 = -91.35%