Present value $($with changing years$).$ When they are first born, Grandma gives each of her grandchildren a $$3,500$ savings bond that matures in $18$ years. For each of the following grandchildren, what is the present value of each savings bonds if the current discount rate is $4\mathrm{.}5\%?$

a$.$ Seth turned fifteen years old today.

b$.$ Shawn turned twelve years old today.

c$.$ Sherry turned ten years old today.

d$.$ Sheila turned five years old today.

e$.$ Shane was just born.

a$.$ Seth just turned fifteen years old today and the current discount rate is $4\mathrm{.}5\%.$ What is the present value of his savings bond?