b$.$ An initial $$800$ compounded for $10$ years at $6\%$

$

c$.$ The present value of $$800$ due in $10$ years at $3\%.$

$ $$

d$.$ The present value of $$1,735$ due in $10$ years at $6\%$ and $3\%.$

Present value at $6\%$:$ $$

Present value at $3\%$ : $ $$