I live in a resort town that is known for, among other things, candy...specifically fudge and salt water taffy. So there are, like, 6 fudge shops in town. At EVERY ONE of them, when you ask for "X" amount of fudge, the server gets out the bag or box, puts in the fudge, throws it on the scale, and says, "It's a little over. Is that ok?" 99.9% of the people say, "Sure, it's ok" and they walk out with more fudge than they wanted.
Little comments and questions can pay off big.