-74.32% is the change from 331 to 85
Calculation steps:
[( 85 - 331 ) ÷ 331] x 100 = -74.32%
Formula
Percentage change = [(85 - 331) / 331] x 100
Subtract the new number by the original number
85 - 331 = -246
-246 ÷ 331 = -0.743202416918429
-0.743202416918429 x 100 = -74.32%