The price for the items ordered at lunch was $31.50. How much would the price be after tax and tip if the tax rate is 9% and you plan to tip 18% of the new total?
Multiply the start price ($31.50) by the tax rate (.09) to get how much tax will be added to the start price. 31.50 x .09 = 2.835 or about 2.84 Tax = $2.84 New total = $34.34
Multiply the new total ($34.34) by the planned tip (.18) to get how much you will tip in addition to the new total. 34.34 x .18 = 6.1812 or about 6.18 Tip = $6.18 Final total = $40.52