Carmen Corporation is considering several investments.

Instructions
  (a) One investment returns $10,000 per year for 5 years and provides a return of 10%. What is the cost of this investment?
  (b) Another investment costs $50,000 and returns a certain amount per year for 10 years, providing an 8% return. What amount is received each year?
  (c) A third investment costs $70,000 and returns $11,971 each year for 15 years. What is the rate of return on this investment?