7. An insurance company accepts an obligation to pay 10,000 at the end of each year for two years. The insurance company purchases a combination of the following two bonds at a total cost of X in order to exactly match its obligation: 1-year 4% annual coupon bond with a yield rate of 5%, 2-year 6% annual coupon bond with a yield rate of 5%. Calculate X A. 18,564 B. 18,574 C. 18,584 D. 18,594 E. 18,604