-91.2% is the change from 341 to 30
Calculation steps:
[( 30 - 341 ) ÷ 341] x 100 = -91.2%
Formula
Percentage change = [(30 - 341) / 341] x 100
Subtract the new number by the original number
30 - 341 = -311
-311 ÷ 341 = -0.9120234604105572
-0.9120234604105572 x 100 = -91.2%