When the straight-line method of amortization is used for a bond discount, the amount of interest expense for an interest perlo calculated by O multiplying the face value of the bonds by the stated interest rate. O multiplying the face value of the bonds by the market interest rate. adding the amount of discount amortized for that period to the amount of cash paid for interest during the period. subtracting the amount of discount amortized for that period from the amount of cash paid for interest during the period