D: 85=1.26f
Explanation
Step 1
Let
total = 85
tax = 6% = 0.6
tip= 20%= 0.20
tax + tip = 0.26* cost of the food
cost of the food = f
Step 2
make the equation
in words, then replace
the total cost = cost of food+ cost of tax and tip
replace
[tex]\begin{gathered} 85=f+0.26f \\ 85=f(1+0.26) \\ 85=1.26f \end{gathered}[/tex]