-52.17% is the change from 669 to 320
Calculation steps:
[( 320 - 669 ) ÷ 669] x 100 = -52.17%
Formula
Percentage change = [(320 - 669) / 669] x 100
Subtract the new number by the original number
320 - 669 = -349
-349 ÷ 669 = -0.5216741405082213
-0.5216741405082213 x 100 = -52.17%