An insurance company must make a payment of $19,487 in eight years. The market interest rate is 8%, so the present value of the obligation is $10,000. The companys portfolio manager wishes to fund the obligation using two-year zero-coupon bonds and perpetuities paying annual coupons. (We focus on zeros and perpetuities to keep the algebra simple.). whats the duration of the perpetuity asset? A. 8.5 B. 11 C. 10.5 D. 13.5