Question

A set of five "100-year," sixty (60) watt light bulbs costs $24.52. If H equals the annual number of hours the buib is used, each bulb provides 100H hours of light, and the efficiency of each bulb is 70%. A set of five, sixty (60) watt standard bulbs costs $2.93. Each standard bulb pr ide s H ho sof light and the efic y of each but is 90%. If the cost of elect city is SO 0589/ W n, how many hours of operation each year will make the costs of the two types of bul breaka on? You p a M Ra 7% per year. Assume repeatability. Click the icon to view the interest and annuity table for discrete compounding when the MARR s 7% per year. hours of operation each year will make the costs of the two types of bulb breakeven. (Round to one decimal place)

Answer 1

Ans To break even, osperrhour has to be same Henee 2.93 24 3 2 tl = 9.294 houvS