The cost of lunch is $45.00. Tax is 8.75 percent. Tip is 20 percent. What is the total amount?

Cost of lunch = $45

Cost of tax = 8.75% of 45 = 0.0875 * 45 = $3.93
Cost of tip = 20% of 45 = 0.2 * 45 = $9

Sum it up for the total amount spent.

Is you tip before tax, as it should be ?

amount = 45(1.0875) + 45(.2) = ....

If you tip after tax ...
amount = 45(1.0875)(1.2) = .....

To calculate the total amount, you will need to add the cost of lunch, the tax amount, and the tip amount together.

First, let's calculate the tax amount. The tax is given as 8.75 percent, which means you need to find 8.75 percent of $45.00.

To do this, you can multiply $45.00 by 0.0875 (since 8.75% is equivalent to 0.0875).

Tax amount = $45.00 * 0.0875 = $3.9375

Next, let's calculate the tip amount. The tip is given as 20 percent, so you need to find 20 percent of $45.00.

To do this, multiply $45.00 by 0.20 (since 20% is equivalent to 0.20).

Tip amount = $45.00 * 0.20 = $9.00

Finally, add the cost of lunch, the tax amount, and the tip amount together to find the total amount.

Total amount = $45.00 + $3.9375 + $9.00 = $57.9375

Therefore, the total amount is $57.94.