55.信用狀規定“Available with us by acceptance, Drafts drawn at 60 days after sight”並表明“We will pay at maturity, acceptance commissions and discount charges for Beneficiary's account”，該筆出口押匯應計收幾天利息？（該筆出口押匯無瑕疵） (A) 7 天 (B) 15 天 (C) 30 天 (D) 60 天