The correct option is: C. Add the two bags together, multiply by .80, and then subtract $1.00.
First you need to add the prices of two bags for getting the total sales price.
Now, the store is offering 20% off, that means you need to pay 80% of the total sales price. For finding the amount, we need to multiply the total sales price by 0.80
Then, you have a manufacturers coupon for a $1.00 off. So, for fining the final price, you need to subtract that $1.00 from the last result.
Thus, the correct option will be……
C. Add the two bags together, multiply by .80, and then subtract $1.00.