-50.61% is the change from 330 to 163
Calculation steps:
[( 163 - 330 ) ÷ 330] x 100 = -50.61%
Formula
Percentage change = [(163 - 330) / 330] x 100
Subtract the new number by the original number
163 - 330 = -167
-167 ÷ 330 = -0.5060606060606061
-0.5060606060606061 x 100 = -50.61%