Suppose Shaan invested just $10,300 of his own money and had a $93,000 mortgage with an interest rate of 9.5 percent. After three years, he sold the property for $128,500.
(a) What is his gross profit?
(b) What is his net profit or loss? (Input the amount as a positive value.)
(c) What is the rate of return on investment? (Negative amount should be indicated by a minus sign. Enter your answer as a percent rounded to 2 decimal places.)