-42.81% is the change from 320 to 183
Calculation steps:
[( 183 - 320 ) ÷ 320] x 100 = -42.81%
Formula
Percentage change = [(183 - 320) / 320] x 100
Subtract the new number by the original number
183 - 320 = -137
-137 ÷ 320 = -0.428125
-0.428125 x 100 = -42.81%