I know the solution for this question. Howerver, why is the Number of Period 28? Instead of 30 because since it semi-annually ( 15 x 2 = 30?)

Pricing a semi-annual bond: Last year, he Harvsi: Tirne Corporation sold $40,000,000 worth of 7.5% coupon, 15-year maturity, $1000 par value, AA-rated; non- callable bonds to finance its business expansion. Currently, investors are demanding a yield of 8.5% on similar bonds. If you own one of these bonds and want to sell it, how much money can you expect to receive on it