-69.64% is the change from 280 to 85
Calculation steps:
[( 85 - 280 ) ÷ 280] x 100 = -69.64%
Formula
Percentage change = [(85 - 280) / 280] x 100
Subtract the new number by the original number
85 - 280 = -195
-195 ÷ 280 = -0.6964285714285714
-0.6964285714285714 x 100 = -69.64%