It’s Not Rocket Sales, People

I work in a call center for a store. The store is running a promotion on a particular product. It’s resulted in some stupid questions.

Caller #1: “If [bottled item] is buy-one-get-one-free, how many do I have to buy to get a free bottle?”

And:

Caller #2: “If this is two for $10, how much money is four bottles?”

When I explained on multiple phone calls that the promotion makes it $5 each, they would ask if I was sure, and then they would check their calculators and state that they were impressed with my math.