$($a$)$

What is the future value of $20$ periodic payments of $$8,500$ each made at the beginning of each period and compounded at $6\%?$

$($Round factor values to $5$ decimal places, e$.$g$.1\mathrm{.}25124$ and final answer to $2$ decimal places, e$.$g$.4,585\mathrm{.}81.)$

The future value $