-48.64% is the change from 331 to 170
Calculation steps:
[( 170 - 331 ) ÷ 331] x 100 = -48.64%
Formula
Percentage change = [(170 - 331) / 331] x 100
Subtract the new number by the original number
170 - 331 = -161
-161 ÷ 331 = -0.486404833836858
-0.486404833836858 x 100 = -48.64%