Question

A server at a restaurant is hoping for a 15% tip from a large party. The party's bill at the end of the night was $312.00. Write a proportion and describe how you would solve it to calculate the amount of the tip the server hopes to receive. Be sure to state your final answer as an amount of money, rounded to the nearest cent.

Answer 1

supercalifragilisticexpialidocious

Answer 2

Tip Total: $46.80

Total (Bill + Tip): $358.80

Explanation:

You can get a good approximation of the tip amount by doing it in your head.

Find 10% of your bill by moving the decimal one place to the left. If 26.50 is 100% then 2.65 is 10%. Since 20% is 2 times 10%, 20% of the bill is 2.65 + 2.65 = 5.30.

Now you know the tip you could leave ranging from poor to good, 10% to 20% is $2.65 to $5.30. To find 15% which is halfway in between take the 10% and add half of that which would be another 5%. 2.65 plus about 1.30 is 3.95.

Now you have

10% is 2.65 - by moving decimal 1 place to the left

15% is 3.95 - 10% + half of 10%

20% is 5.30 - 10% * 2