Final answer:
The cost of the lunch after a 15% tip can be represented by the expression 1 + 0.151. Simplify the expression to 1.151. The total cost of the lunch after the tip, if the lunch bill is $8, is $9.20.
Step-by-step explanation:
To simplify the expression 1 + 0.151, you can add the two numbers together.
1 + 0.151 = 1.151
Therefore, the simplified expression is 1.151.
To determine the total cost of the lunch after the tip, you need to multiply the lunch bill ($8) by the tip percentage (0.15).
$8 x 0.15 = $1.2
Adding the tip to the lunch bill, the total cost of the lunch after the 15% tip is $9.20.