$17)$ Consider a $$1,000$ par value bond with a $9\%$ coupon rate, semi$-$annual payments, $6$ years to

maturity and a price of $$1,200.$ What is the Macaulay duration?

$18)$ Consider a $$1,000$ par value bond with a $6\%$ coupon rate, semi$-$annual payments, $12$ years to

maturity and a yield to maturity of $5\%.$ What is the Macaulay duration?