Answer:
The answer is $20.21
Step-by-step explanation:
So first you find the subtotal cost of the lunches. Each lunch costs $20, so that would be $40 in total.
Now you find the total cost.
She has to pay 5% sales tax so to find the total, you have to multiply 40 by 0.05. That gives you a total of $2. Then you add that to your $40 to get $42.
Now for the tip.
It says to find 10% of 20, so you have to multiply 20 by 0.1. That equals 0.208. Then you add that to 20 to get 20.208.
If you round off, you get a total of $20.21
