b) If the present value of US$150 paid at the end of one year is US$130, what is the one-year discount factor? What is the discount rate? c) An investment costs US$1,548 and pays US$138 in perpetuity. If the interest rate is 9 percent, what is the NPV? d) If cost of capital is 9 percent, what is the PV of US$374 paid in year 9