4. Suppose an individual investor purchased a Treasury bill for $49,000. The T-bill matured exactly one year later at its par value of $50,000. [16 points] (a) What dollar amount of income is subject to federal income taxation? (b) What dollar amount of income is subject to state income taxation? (c) Calculate the holding period rate of return. Use 2 decimal places. (d) What type of risk is absent from this investment