-20% is the change from 330 to 264
Calculation steps:
[( 264 - 330 ) ÷ 330] x 100 = -20%
Formula
Percentage change = [(264 - 330) / 330] x 100
Subtract the new number by the original number
264 - 330 = -66
-66 ÷ 330 = -0.2
-0.2 x 100 = -20%
Example