The entry to record the issuance includes a debit to Cash for $139,875 (or par of $150,000 x 0.9325=139,875), a debit to Discount on Bonds Payable for $10,125 (or par value of $150,000 - issue price of $139,875), and a credit to Bonds Payable for $150,000 (the par value).
Amount repaid = Interest payments of $105,000
20 x ($150,000 x 7% x ½)) = $105,000 + $150,000 (par value paid at maturity)= $255,000
Total bond interest expense = $255,000 – $139,875 = $115,125