-56.56% is the change from 320 to 139
Calculation steps:
[( 139 - 320 ) ÷ 320] x 100 = -56.56%
Formula
Percentage change = [(139 - 320) / 320] x 100
Subtract the new number by the original number
139 - 320 = -181
-181 ÷ 320 = -0.565625
-0.565625 x 100 = -56.56%