So we can see that the cost of the pizza is 24 which already includes a 5% tax and a 20% tip. What we want to find out would be the original cost of the pizza less the tax rate and the tip. So first, we will minus the tax rate which is 5%. First we multiply 24 with 5% or 0.05 which will become 1.2. Then after that, we multiply 24 with 20% or 0.2 so that it will become 4.8. Add 4.8 and 1.2 and it will become 6. After that, we will subtract 6 from the original price 24 since 6 is the total additional cost he incurred. This will give us an answer of 18.
