-8.24% is the change from 85 to 78
Calculation steps:
[( 78 - 85 ) ÷ 85] x 100 = -8.24%
Formula
Percentage change = [(78 - 85) / 85] x 100
Subtract the new number by the original number
78 - 85 = -7
-7 ÷ 85 = -0.08235294117647059
-0.08235294117647059 x 100 = -8.24%