hey
I just bought an antminer s3 on gawminers

Since they're so cheap, I'm afraid they're going to run out of stock and I'm looking to buy another one
but since I had only 1.47
BTC , paid the first one 0.75
BTCNow I have 0.72
BTC and the other one costs 0.75
BTCI'm 0.03
BTC short for the other miner

I can only start mining at 8th August since this is a preorder
2 of them will produce 0.0257 BTC daily according to
http://www.bitcoinx.com/profit/So I would be able to pay the loan back in 2 days
I don't want the loan right away since I'm going to try to acquire the funds any other way

I'm just wondering how big would the interest be?
Thanks