You Are Thinking of Making Your Mansion More Energy Efficient

Short Answer

You are thinking of making your mansion more energy efficient by replacing some of the light bulbs with compact fluorescent bulbs, and insulating part or all of your exterior walls. Each compact fluorescent light bulb costs $4 and saves you an average of $2 per year in energy costs, and each square foot of wall insulation costs $1 and saves you an average of $0.20 per year in energy costs. Your mansion has 252 light fittings and 3,000 sq. ft. of un-insulated exterior wall. To impress your friends, you would like to spend as much as possible, but save no more than $880 per year in energy costs (you are proud of your large utility bills).
If no optimal solution exists enter no solution.
How many fluorescent light bulbs should you purchase
Number of light bulbs = __________
How many square feet of insulation should you purchase
Number of sq.ft. of insulation = __________
How much will you save in energy costs per year
Saving = $ __________