$4\mathrm{.}11$ For a $4-$month research project on reverse osmosis,

$$ a pilot facility will be rented for $$6,900$ per month,

$$ the electrical work will cost $$8,500$ now, and

$$ the technician to install the electrical work will charge $$2,000$ monthly.

$$ shipping will cost $$2,300$ at the beginning and end of the project $($months $0$ and $4)$ and,

$$ an additional $$1,300$ will be paid to the technician in the $4$th month for demobilization.

If the interest rate is $6\%$ per month, what is the present value of the pilot facility?