A woman borrows $30,000 from her bank to buy land. The rate of interest she must pay (Interest for renting bank's money) is 12% annually. The bank tells her that her monthly mortgage payment is $308.59 for 30 years. 

I. How much of her first payment goes toward interest and principal?

II. What is the balance on her mortgage at the end of the first month?

 III. How Much Does The Borrower Pay Over 30 Years? 

IV. What Was The Principal of The Loan? 

V. What Was The Bank's ROI On This Mortgage?