The decision has been applied in this court to bond issuance costs generally. Chicago, Milwaukee R. Co. v. United States, 404 F.2d 960, 967, 186 Ct.Cl. 250, 262 (1968). The Supreme Court in its opinion said that discount and expense were both "factors in arriving at the actual amount of interest paid for the use of capital procured by a bond issue" which "must be added to the aggregate coupon payments in order to arrive at the total interest paid."