-55% is the change from 320 to 144
Calculation steps:
[( 144 - 320 ) ÷ 320] x 100 = -55%
Formula
Percentage change = [(144 - 320) / 320] x 100
Subtract the new number by the original number
144 - 320 = -176
-176 ÷ 320 = -0.55
-0.55 x 100 = -55%
Example