Pls answer both pls pls

A bond's coupon rate is less than its required rate of return is a a. Discount bond b. Par bond c. Premium Bond d. Coupon Bond 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 receive What is the amount of interest received by him? a. $280 b. $180 c. $1800 d. $3420