-72.19% is the change from 320 to 89
Calculation steps:
[( 89 - 320 ) ÷ 320] x 100 = -72.19%
Formula
Percentage change = [(89 - 320) / 320] x 100
Subtract the new number by the original number
89 - 320 = -231
-231 ÷ 320 = -0.721875
-0.721875 x 100 = -72.19%