From my understanding from the CFD meeting of last eve if you spend $5,000 to get access to $100,000 worth of stock then you pay interest at the rate of 2% above the bank(I think) rate which if it is 5.5% then you pay 7.5% so work out the int rate on $95,000 over a day, week etc etc.
If you sell short you receive int at 5.5% less 2%.
