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 $$10,500$ to install and will have a useful life of $4$ years with no salvage value. Annual costs for inspection, cleaning, etc. are expected to be $$1,950.$ A new power line will cost $$17,500$ to install, with power costs expected to be $$950$ 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 $15\%$ per year, which alternative should be selected on the basis of a future worth analysis?

The future worth of solar cells is $

and that of electric line is $