40 packs of baseball cards for discounted price of 64 he sells 30 packs of baseball cards to a friend at cost much should he charge

$48

Step by step:
1. 30 packs times 64 dollars is 1920
2. 1920 divided by 40 packs is 48
because if you pay 64 for 40 packs and your trying to figure out how much for 30 packs you will want to set it up like this:


then you will use fishy method Google fish method in math if this doesn't help