-86.6% is the change from 321 to 43
Calculation steps:
[( 43 - 321 ) ÷ 321] x 100 = -86.6%
Formula
Percentage change = [(43 - 321) / 321] x 100
Subtract the new number by the original number
43 - 321 = -278
-278 ÷ 321 = -0.8660436137071651
-0.8660436137071651 x 100 = -86.6%