-56.25% is the change from 320 to 140
Calculation steps:
[( 140 - 320 ) ÷ 320] x 100 = -56.25%
Formula
Percentage change = [(140 - 320) / 320] x 100
Subtract the new number by the original number
140 - 320 = -180
-180 ÷ 320 = -0.5625
-0.5625 x 100 = -56.25%