You have been asked to value a $40-$year bond, issued by Boeing, with the following features: The coupon rate for the first $20$ years will be $6\%$ of the face value of $$1,000.$ After $20$ years, the coupon rate will be $6\%$ of the face value of $7\%$ for the remaining $20$ years. Estimate the value of this bond, if Boeing is rated AA$.($AA$-$rated bonds are trading at a default spread of $0\mathrm{.}50\%$ over the treasury bond rate of $6\mathrm{.}50\%).$ without excell.