Answer: $53.13
Step-by-step explanation:
First find how much they spent on tax by multiplying 42.50 by 7%.
7% * 42.50 = 2.98 This means the tax amount was $2.98.
Next find the how much the tip was by multiplying 18% by 42.50.
18% * 42.50 = 7.65 This also means the tip was $7.65.
Now combine the cost of the dinner plus the cost of tax plus the cost of tip to find how much in total they spent.
42.50 + 7.65 + 2.98 = 53.13
