Make an excel spreadsheet answering the following question

A $30-$year maturity bond has a $7\%$ coupon rate, paid annually. It sells today for $$867\mathrm{.}42.$ A $20-$year maturity bond has a $6\mathrm{.}5\%$ coupon rate, also paid annually. It sells today for $$879\mathrm{.}50.$ A bond market analyst forecasts that in five years, $25-$year maturity bonds will sell at yields to maturity of $8\%$ and that $15-$ year maturity bonds will sell at yields of $7\mathrm{.}5\%.$ Because the yield curve is upward$-$sloping, the analyst believes that coupons can be invested in short$-$term securities at a rate of $6\%.$

a$.$ Calculate the expected rate of return of the $30-$year bond over the

five$-$year period.

b$.$ What is the expected return of the $20-$year bond?