A compressed air system stores the energy generated by solar panels on the company buildings' rooftops during the weekend for use during the week. The generated electricity over the weekend is used to compress air from atmospheric pressure to 10 atm; the air is then brought back to atmospheric pressure as needed during the week. What is the lost work per joule of electricity produced by the solar panel when the efficiencies of compression and decompression are both 100 percent and when they are both 80 percent?