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 $19,500 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 $1,150. A new power line will cost $9,500 to install, with power costs expected to be $850 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 $ .

(Click to select) (Solar cells, Electric line)should be selected on the basis of a future worth analysis.