-46.88% is the change from 320 to 170
Calculation steps:
[( 170 - 320 ) ÷ 320] x 100 = -46.88%
Formula
Percentage change = [(170 - 320) / 320] x 100
Subtract the new number by the original number
170 - 320 = -150
-150 ÷ 320 = -0.46875
-0.46875 x 100 = -46.88%