-45.94% is the change from 320 to 173
Calculation steps:
[( 173 - 320 ) ÷ 320] x 100 = -45.94%
Formula
Percentage change = [(173 - 320) / 320] x 100
Subtract the new number by the original number
173 - 320 = -147
-147 ÷ 320 = -0.459375
-0.459375 x 100 = -45.94%