It's not natural because it is not positive. It is a whole integer because there is no decimal part. It's rational because it can be written as a ratio. It is not irrational because it is rational.
The large cup is best to buy. This is because it costs 11 cents per ounce for the medium cup and 11 cents for the large cup as well. You get almost double the amount for the same price with the large cup.
