-84.69% is the change from 320 to 49
Calculation steps:
[( 49 - 320 ) ÷ 320] x 100 = -84.69%
Formula
Percentage change = [(49 - 320) / 320] x 100
Subtract the new number by the original number
49 - 320 = -271
-271 ÷ 320 = -0.846875
-0.846875 x 100 = -84.69%