-84.35% is the change from 345 to 54
Calculation steps:
[( 54 - 345 ) ÷ 345] x 100 = -84.35%
Formula
Percentage change = [(54 - 345) / 345] x 100
Subtract the new number by the original number
54 - 345 = -291
-291 ÷ 345 = -0.8434782608695652
-0.8434782608695652 x 100 = -84.35%