Ellen spent $15.45 on lunch at a restaurant. How much will she pay for a 20% tip? What is her total cost for lunch with the tip? Be sure to give answers to both questions. (Use the Lesson 4 notes for help)(2 points)

To find the amount of the tip, you need to multiply the cost of the lunch by the tip percentage.

Tip amount = $15.45 * 0.20 = $3.09

So, Ellen will pay $3.09 for a 20% tip.

To find the total cost for lunch with the tip, you need to add the cost of the lunch and the tip amount.

Total cost = $15.45 + $3.09 = $18.54

So, Ellen's total cost for lunch with the tip is $18.54.