-91.28% is the change from 344 to 30
Calculation steps:
[( 30 - 344 ) ÷ 344] x 100 = -91.28%
Formula
Percentage change = [(30 - 344) / 344] x 100
Subtract the new number by the original number
30 - 344 = -314
-314 ÷ 344 = -0.9127906976744186
-0.9127906976744186 x 100 = -91.28%