You own $30-$year Treasury Bonds that you bought exactly $6$ years ago. At the time $($you bought the T$-$Bonds when they were issued$),$ the $30-$year T$-$Bond yield was $3\mathrm{.}75\%$ APR $($compounded semi$-$annually$).$ That yield was also the coupon rate used to compute the semi$-$annual coupon payments $($the T$-$Bonds were issued exactly at par$).$ The T$-$Bonds have a total face value of $$50,000.$

You just received an interest payment, and the bonds will mature in exactly $24$ years. Today$$s yield for such a long$-$maturity T$-$Bond is $1\mathrm{.}40\%($APR$,$ compounded semi$-$annually$).$

a$.$ What is the current market value of your T$-$Bonds?

b$.$ By what percentage has the value of your T$-$Bonds increased or decreased since you bought them?