-84.3% is the change from 344 to 54
Calculation steps:
[( 54 - 344 ) ÷ 344] x 100 = -84.3%
Formula
Percentage change = [(54 - 344) / 344] x 100
Subtract the new number by the original number
54 - 344 = -290
-290 ÷ 344 = -0.8430232558139535
-0.8430232558139535 x 100 = -84.3%