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Example 3.15 from Elementary Algebra, 3.2 Solve Percent Applications
Solve Percent Applications: example 3.15
Dezohn and his girlfriend enjoyed a nice dinner at a restaurant and his bill was $68.50. He wants to leave an 18% tip. If the tip will be 18% of the total bill, how much tip should he leave?
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
Solution
Step 1. Read the problem. Step 2. Identify what we are looking for. the amount of tip should Dezohn leave Step 3. Name what we are looking for. Choose a variable to represent it. Let t = amount of tip. Step 4. Translate into an equation. Write a sentence that gives the information to find it. Translate the sentence into an equation. Step 5. Solve the equation. Multiply. Step 6. Check. Does this make sense? Yes, 20% of $70 is $14. Step 7. Answer the question with a complete sentence. Dezohn should leave a tip of $12.33. Notice that we used t to represent the unknown tip.
Your turn
The book's Try It right after this example: same idea, new numbers. Only the answer is given.
Cierra and her sister enjoyed a dinner in a restaurant and the bill was $81.50. If she wants to leave 18% of the total bill as her tip, how much should she leave?
How did it go?