-91.4% is the change from 349 to 30
Calculation steps:
[( 30 - 349 ) ÷ 349] x 100 = -91.4%
Formula
Percentage change = [(30 - 349) / 349] x 100
Subtract the new number by the original number
30 - 349 = -319
-319 ÷ 349 = -0.9140401146131805
-0.9140401146131805 x 100 = -91.4%