First we have to find out what the amount the customer is tipping is. To do this, we multiply the percentage of tip times the total bill.
Note: 15% = 0.15
0.15 * 35 = 5.25
Therefore, the customer is tipping $5.25.
To find the total bill, we add the tip and the regular bill together.
35 + 5.25 = $40.25
Therefore, the customer's total bill, including the tip is $40.25.