-50.67% is the change from 669 to 330
Calculation steps:
[( 330 - 669 ) ÷ 669] x 100 = -50.67%
Formula
Percentage change = [(330 - 669) / 669] x 100
Subtract the new number by the original number
330 - 669 = -339
-339 ÷ 669 = -0.5067264573991032
-0.5067264573991032 x 100 = -50.67%