Help With ROI On Private money

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I can use a little help on a ROI calculation attached. I'd need to walk you through it for you to understand what all needs to be done but, in a nutshell, I want to know how much money we make if he uses all of our available credit with a few variables. Those variable are that the average loan will take 5 months, after he pays us off on month 5, the money sits idle for 90 days and then he uses is again essentially giving us two originations in 8 months.

I am so confused any help would be greatly appreciated.