You can buy those 2 gold coins for a bit more than $300. I assume that your 40's you got from CRH so you would be getting that gold for 50 bucks in a trade
Rich
American gold eagles sell at a premium over spot gold price. Usually, the smaller the coin the higher the premium. Just checked e-bay completed sales and non-proof 1/10 eagles have been going from about $155 -$165 or so. Your 100 40% halves would be around $360, but you almost always get below spot for silver as we are not at the top of the chain. As Rich said if you got your halves CRH you only have $50 in them. If you wat to own some gold this is about an even trade based on value.