-50.3% is the change from 330 to 164
Calculation steps:
[( 164 - 330 ) ÷ 330] x 100 = -50.3%
Formula
Percentage change = [(164 - 330) / 330] x 100
Subtract the new number by the original number
164 - 330 = -166
-166 ÷ 330 = -0.503030303030303
-0.503030303030303 x 100 = -50.3%