-79.69% is the change from 320 to 65
Calculation steps:
[( 65 - 320 ) ÷ 320] x 100 = -79.69%
Formula
Percentage change = [(65 - 320) / 320] x 100
Subtract the new number by the original number
65 - 320 = -255
-255 ÷ 320 = -0.796875
-0.796875 x 100 = -79.69%