-48.75% is the change from 320 to 164
Calculation steps:
[( 164 - 320 ) ÷ 320] x 100 = -48.75%
Formula
Percentage change = [(164 - 320) / 320] x 100
Subtract the new number by the original number
164 - 320 = -156
-156 ÷ 320 = -0.4875
-0.4875 x 100 = -48.75%