Question: Joseph's lunch at a restaurant costs 13.00, without tax. He leaves the waiter a tip of 17% of the cost of the lunch, without tax. What is the total cost of the lunch, including the tip, without tax?
A) 2.21
B) 10.79
C) 13.17
D) 15.21
Correct answer: D
Grade: 7 | Topic: Ratios and proportions | Difficulty: Medium | Standard: 7.RP.A.3