Of course she knows that. Not because she's cheated anyone with her coins, but because she never wanted to be cheated. When every bit of coin you have is going toward one, large, unknown price goal, you weigh them and make sure no one is screwing with you.

"0.41 ounces." She hopes he'll know the unit of weight. It seems like one of those things he would just know. "I hope that won't be a problem for a man such as yourself."