4. A company wants to borrow a large sum of money to be repaid over 10 years. The company can issue bonds paying interest at j2 = 84 redeemable at par in 10 years. A sinking fund earning j12 = 72% can be used to accumulate the amount needed in 10 years to redeem the bonds. At what rate, 112, would the semi-annual cost be the same if the debt were amortized over 10 years