can you help me with this qurstion. which formula shall i use?

SELF-CHECK 7.1 oa value Bounder Berhad issued a long-term bond with a face value of $1,000, and a 10% coupon rate. It has 25 years remaining until maturity, and a current market value of $1,214.82 What is the nominal annual pre-tax cost of debt if it pays an interest semi-annually? Answer: 8%) What is the after-tax cost of debt if the Bounder's tax rate is 40%? (Answer: 4.8%) of 3. The preferred stock you hold has an annual dividend of RM5, and its required rate is 8%. What is the Vps? ($62.50) alt