-91.76% is the change from 85 to 7
Calculation steps:
[( 7 - 85 ) ÷ 85] x 100 = -91.76%
Formula
Percentage change = [(7 - 85) / 85] x 100
Subtract the new number by the original number
7 - 85 = -78
-78 ÷ 85 = -0.9176470588235294
-0.9176470588235294 x 100 = -91.76%