-49.38% is the change from 320 to 162
Calculation steps:
[( 162 - 320 ) ÷ 320] x 100 = -49.38%
Formula
Percentage change = [(162 - 320) / 320] x 100
Subtract the new number by the original number
162 - 320 = -158
-158 ÷ 320 = -0.49375
-0.49375 x 100 = -49.38%