Calculating yield for mortgage/deed of trust (Business/finance/real estate)

A investor purchased a trust deed and note at a 20% discount. This was a one year fully amortized note with a face amount of $1,500.00 with payments of $131.00 per month including 9% interest. If she holds the note for the full year, the yield on her briginal investment would be: A. 29% B. 31% 24% D. 36%