Indianapolis Real Estate Note - Yield Calculations

[Ben G.]

I'm not the greatest at Math so if anyone can help me calculate the yield on this deal it would be greatly appreciated.  To me it looks like a good deal.  Clause in contract makes Tenant buyer responsible for maintenance, repairs, taxes, utilities, and insurance. You will see in the contract that they are paying $604.40 per month.

The seller sold the property to the tenant buyers on Land Contract.  The details are below.  He is willing to sell to me for $18,500.   If I were to purchase this at $18,500 what would be my yield? Also, what is the formula I would use to calculate my yield so that I can learn something new!  Also, does the community see this as a good deal?  It is in a C neighborhood/ blue collar in Indianapolis.

Maybe a creative finance guru such as @Aaron Mazzrillo would be willing to lend his expert opinion?