A firm has a corporate bond of 30-year maturity has a face value of $100 and promises semi-annual coupon payments of $3. The yield to maturity of 30-year government bond is 5%. On the maturity date, the firm has a probability of 50% default. When that happens, the firm pays coupon and only pay 30% of face value. What should be the promised yield to maturity of this corporate bond? What is the yield spread