Chapter 11, "Hone Your Skills" section has this practice question: "What is the IRR of an investment that costs $75,000 up front, earns you $22,000 per year for four years, and then generates $115,000 at sale?"

Check out other online guides available here: https://www.biggerpockets.com/guides3.

Also @Jayhinrichs the tax sales here are done online now.

Many people online will tell you you can QuickClaim it yourself (which you can), but I always use an attorney. 

I will not respond to online requests but if I am directly asked, I will take Tom T’s advice and state that they rented from me for the 13 months and have paid in full.  

Perhaps give them an option of submitting the info to you via email or an online form -might save you a few dollars in return postage.

If either of you can point me to any groups online that might have more info I would appreciate it thanks.

Looking online is better than nothing, but selected pictures never tell the full story. 

I tried to search online to renew but my name is not under this previous certificate. 2.

Easy to install and the options are practically unlimited.