Can someone please explain how to find the amortized cost? This is what i came up with trying to use Excel PV forumla. Thank you!

Adjust FVA at Year-End On July 1 of the current year, West Company purchased for cash, 30, $10,000 bonds of North Corporation at a market rate of 6%. The bonds pay 5% interest, payable on a semiannual basis each July 1 and January 1, and mature in three years on July 1. The bonds are classified as trading securities. The annual reporting period ends December 31. Assume the effective interest method of amortization of any discounts or premiums. Ignore income taxes. Note: When answering the following questions, round answers to the nearest whole dollar. a. Prepare a bond amortization schedule for the life of the bonds using the effective interest method. Date Stated Interest Jul. 1, Year 1 Jan. 1, Year 2 $ Jul. 1, Year 2 Jan. 1, Year 3 Jul. 1, Year 3 Jan. 1, Year 4 Jul. 1, Year 4 7,500 $ 7,500 7,500 7,500 7,500 Market Discount Bond Interest Amortization Amortized Cost $ 285,248.03 x Ox $ 0x 0X 0x OX 0X OX 0 x OX 0 X 7,500 OX OX 0 X