A descent book showing the common problems for financing and anylzing properties. Each lesson shows the problem, the variables, an example, and how to do it using the HP-12C calculator (a reverse polish notation RPN style calculator)...since each problem has dedicated steps to this calculator you may find that you don't read most of this book unless you have the calculator. Using a regular calculator you have to figure out the functions on your own. Overall I got limited use from this book, but it does contain most of what you would need for analyzing investments.