q4 q5 solve both please

Which of the following statement is not true about T-Bill? a. T-Bills are sold on a discount basis, because they have no coupon payments b. T-Bills are short-term debt obligations issued by the government of a country c. T-Bills have strong international demand as they are safe haven investment d. T-Bills are issued by commercial banks. QUESTION 5 Suppose an investor purchases a 91 days Treasury bill with a face value of $1,800 for $1,620. By holding the bill until the maturity date, the investor receives $1,800. What is the amount of interest received by him? a. $280 b. $180 c. $1800 - 1621300