You are buying potato chips at the grocery store. You have a manufacturer’s coupon for $1.00 off and the store is offering 20% off if you buy 2 bags. You decide to buy two bags of potato chips. How do you compute your final cost?

To compute your final cost when buying two bags of potato chips with a $1.00 manufacturer’s coupon and a 20% discount offered by the store for purchasing 2 bags, you would follow these steps:

1. First, let's assume the price of each bag is \( P \).
2. You buy 2 bags, so the total price before any discounts is \( 2P \).

3. The store offers a 20% discount if you buy 2 bags, which means you will pay 80% of the total price. Therefore, after applying the 20% discount, the total cost becomes:
\[
2P \times 0.80 = 1.6P
\]

4. Now, you will apply the $1.00 coupon. So, you subtract $1.00 from the total cost after the discount:
\[
1.6P - 1.00
\]

Thus, the correct way to compute the final cost is to **add the two bags together, multiply by .80, and then subtract $1.00**.

Therefore, the correct response is:
**Add the two bags together, multiply by .80, and then subtract $1.00.**