12,13, and 14. please help need tobsee eork shown and correct answer to check myself

es worl and 1.3%, respeclively, whil was the un! 15 12. What is the price of a T-bill that matures in 270 days if the discount rate is 0.9% and par is $1000 15 13. What is the price of a zero-counon hond that matures in 16 years if it promised a 3.5% yield to maturit to maturity? Assume 2 par value of $1000 and semiannual compounding (5) 14. What is the yield-to-maturity of a bond maturing in four years with a 4% coupon rate, It S1010 current prie utent price and a $1000 par value