For an apartment building with a total of 20 incandescent lamps rated at 60 W. Determine the energy-saving potential if these lamps are replaced with 13 W CFLs. The lifespan of incandescent lamp and CFL is, respectively, 1300 and 8000 h. Perform the analysis using the lifespan of CFLs. Determine the cost-effectiveness of replacing the incandescent lamps with CFLs if the cost of the incandescent lamp and CFL is \($0.20\) and \($1.40,\) respectively. Assume the cost of electricity is \($0.10/kWh.\) Perform a simple payback period analysis.