-73.75% is the change from 320 to 84
Calculation steps:
[( 84 - 320 ) ÷ 320] x 100 = -73.75%
Formula
Percentage change = [(84 - 320) / 320] x 100
Subtract the new number by the original number
84 - 320 = -236
-236 ÷ 320 = -0.7375
-0.7375 x 100 = -73.75%