The interest portion of an installment note payment is computed by a.dividing the carrying amount (book value) of the note at the beginning of the period by the interest rate. b.multiplying the interest rate by the carrying amount (book value) of the note at the beginning of the period. c.multiplying the interest rate by the carrying amount (book value) of the note at the end of the period. d.dividing the carrying amount (book value) of the note at the end of the period by the interest rate.