Question

li - mei thinks she can save money on electricity by changing all her bulbs from incandescent bulbs to fluorescent bulbs. based on the following energy cost table, how much can she save each year if she replaces 8 bulbs? incandescent bulb - 150 hours monthly use $.05 per hour fluorescent bulb - 150 hours monthly use $.02 per hour a. $36 b. $432 c. $54 d. $1,008 please select the best answer from the choices provided

Explanation:

Step1: Calculate savings per bulb per month

Find the difference in cost per hour and multiply by monthly - usage hours.
$(0.05 - 0.02)\times150$
$= 0.03\times150=4.5$

Step2: Calculate savings per bulb per year

Multiply the monthly savings per bulb by 12 months.
$4.5\times12 = 54$

Step3: Calculate savings for 8 bulbs per year

Multiply the annual savings per bulb by 8.
$54\times8=432$

Answer:

B. $432$