A remotely located air sampling station can be powered by solar cells or by running an electric line to the site and using conventional power. Solar cells will cost $$12500$ to install and will have a useful life of $4$ years with no salvage value. Annual costs for inspection, cleaning, etc. are expected to be $$1350.$ A new power line will cost $$11500$ to install, with power costs expected to be $$1050$ per year. Since the air sampling project will end in $4$ years, the salvage value of the line is considered to be zero. At an interest rate of $11\mathrm{.}00\%$ per year, which alternative should be selected on the basis of a future worth analysis? $($Include a minus sign if necessary.$)$

The future worth of solar cells is $

$x$ and that of electric line is $

should be selected on the basis of a future worth analysis.