Question

A group of friends orders 9 dinners. Each dinner cost the same amount. The tax and tip are $3.50 per dinner. The total cost is $189. What is the cost per dinner before tax and tip

Answer 1

Cost per dinner = $17.50

Explanation:

• We can allow d to represent the cost of the dinner.

We can find d using the following equation:

Total cost = amount of orders (cost of one dinner + tax and tip)

Now we can substitute 189 for the total cost, 9 for the amount of orders, and 3.50 for tax and tip to solve for d, the cost of one dinner:

(189 = 9(d + 3.50)) / 9

(21 = d + 3.50) - 3.50

17.50 = d

Thus, the cost of each dinner is $17.50.