9. [0/1 Points] DETAILS PREVIOUS ANSWERS WANEFMAC7 6.2.031. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER You are thinking of making your home 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 home has 70 light fittings and 1,500 square feet of uninsulated exterior wall. You can spend no more than $1,600 and would like to save as much per year in energy costs as possible. How many compact fluorescent light bulbs and how many square feet of insulation should you purchase? (If an answer does not exist, enter DNE.) compact fluorescent light bulbs 400 x bulbs insulation 1000 x sq ft How much will you save in energy costs per year? $ 880 X