it is given in the question that
You order two tacos and a salad.the salad cost $2.50.you pay 8% sales tax and leave a $3 tip.
Let the price of taco be $ x .
And 8 % of 2.50 is
[tex] =0.08*2.50 = 0.20 [/tex]
So the equation is
[tex] 2x+ 2.50+0.2+3 = 13.80 \\ 2x + 5.70 =13.80 \\ 2x = 8.10 \\ x = $4.05 [/tex]
So the price of the Taco is $4.05 .