math

posted by .

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 200 light fittings and 3100 sq ft of uninsulated exterior wall. To impress your friends, you would like to spend as much as possible, but save no more than $850 per year in energy costs (you are proud of your large utility bills). How many compact fluorescent light bulbs and how many square feet of insulation should you purchase? How much will you save in energy costs per year? (If an answer does not exist, enter DNE.)
compact fluorescent light bulbs 1
insulation 2 ft2
total cost $ 3
energy costs savings $ 4 per year

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Probability and Statistics 2

    The University of Southern Mississippi currently uses GE brad fluorescent light bulbs that have a mean life of 900 hours. Sylvania clams that its new fluorescent bulbs, that cost the same as the GE bulbs, last longer than the GE brand. …
  2. Math

    Daphne replaced light bulbs in her mothers store.She had 3/4 of a box of light bulbs. She used 1/3 of the bulbs. a. What fraction of the box of light bulbs was left?
  3. English

    1. There are many fluorescent lights on the ceiling. 2. There are many fluorescent lamps on the ceiling. 3. There are many fluorescent light bulbs on the ceiling. (Which expressions are right?
  4. Physics Energy

    How would a $10.00 compact fluorescent light bulb (15 W) be an overall money saver compared to an incandescent light bulb (60 W) that costs $0.50?
  5. Energy question

    How would a $10.00 compact fluorescent light bulb (15 W) be an overall money saver compared to an incandescent light bulb (60 W) that costs $0.50?
  6. Physics

    a 75 w compact fluorescent bulb operating at 30% efficiency. Calculate the amount of energy lost to heat and the amount of energy converted into light after the bulb has been on for 2.0h.
  7. English

    Choose the answer that best matches the word "incandescent" One way to save money on electricity is to replace incandescent bulbs with compact fluorescent (CF) light bulbs. a. outside visible spectrum b. creating light by radiating …
  8. An Inconvenient Truth

    5. In An Inconvenient Truth, the author uses which of the following to emphasize how humans can improve the atmosphere?
  9. statistics

    twenty light bulbs are tested three light bulbs fail the test. two light bulbs are selected at random without replacement from this collection of bulbs find the probablilty that both light bulbs failed the test. round the answer 3 …
  10. MATH

    Joaquin buys 3 packs light bulbs. Each pack contains 12 light bulbs. After changing the bulbs in his house, he has 15 bulbs left. How many light bulbs did he use?

More Similar Questions