You work at an auto shop. You have 5 gallons of windshield washer fluid. There are 16 cups in 1 gallon, and 8 fluid ounces in 1 cup. How many fluid ounces of washer fluid do you have?

Convert gallons to cups, then cups to fluid ounces: 5 gallons × 16 cups per gallon × 8 fluid ounces per cup = 640 fluid ounces. Therefore, the correct choice is A) 640.

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