If Carrie and Cory add on 18% tip to the bill after tax what does their lunch cost in total

The cost of total lunch is 1.18 y (1 + 0.0 x)

Step-by-step explanation:

Given as:

The percentage of tip added tot he bill after tax = 18 %

Let the tax added to the bill = x % of total the lunch price

Let The total lunch cost = y

So, The cost of the lunch after tax = y + x % * y

I. e The cost of lunch after tax = y * (1 + x %)

Or. The bill of lunch after tax = y * (1 + 0.0 x)

Now the cost of lunch after tax and tip = 18 % of y * (1 + 0.0 x) + y * (1 + 0.0 x)

Or, the cost of lunch after tax and tip = y * (1 + 0.0 x) (0.18 + 1)

∴ The cost of lunch after tax and tip = y * (1 + 0.0 x) * 1.18

Hence The cost of total lunch is 1.18 y (1 + 0.0 x) Answer