What is my ROI and options?

[Bill C]

My wife and I bought a house for $20,000 cash in August. We have since dropped $10,000 into it. $7500 was new kitchen, 1/2 bath, wiring, master bedroom, insul, electric upgrade, etc. $2500 in travel and food. The current value is $42,000.
Taxes and insurance run $1100/yr.
Rent goes for $525 and should be ready in mid May.

What is my ROI and what would you do with the cash? We want to continue buying, and really like the paid off route.

We also have a contract on 4 houses, but are running into huge obstacles due to a bk over 2 years ago. The purchase price is $180,000. These 4 homes just appraised at a total of $240,000. We are trying to use the equity as a down, but so far 2 lenders want $50,000 down. One lender wants 1% cash and 5 yr fixed, ARM after that and use the equity of the 5 homes (the paid off rental included). I don't want to pull $50k due to a huge taxation from a beneficiary account. I'd like to think that I have an idea on how to do this, but I like training wheels. I'm sorry if this comes off as not making much sense, but I'm trying.