Problem $9-10$ Present value $[$LO$9-3]$

How much would you have to invest today to receive the following? $($Enter all answers as positive numbers.$)$

a$.$ $$12,500$ in $7$ years at $11$ percent. $($Round your answer to $2$ decimal places.$)$

b$.$ $$16,100$ in $15$ years at $10$ percent. $($Round your answer to $2$ decimal places.$)$

c$.$ $$6,250$ each year for $14$ years at $8$ percent. $($Round your answer to $2$ decimal places.$)$