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2 November, 11:21

You can upgrade lighting at your factory to LED bulbs that costs $6.95 each and last an average of 5 years. It costs $3.00 in labor to change a bulb. Over a 10-year period, about how much will it cost per year to install LED bulbs in 100 lamps and change the bulbs when they burn out?

A. $140

B $200

C $440

D $700

E $1,000

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  1. 2 November, 13:29
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    Labor is $3 per bulb, there is 100 lamps, so the labor cost would be 100 x 3 = $300.

    The cost of one bulb is 6.95, the total cost of bulbs is 100 x 6.95 = $695

    The total fr bulbs and labor is $695 + $300 = $995

    The bulbs last 5 years so, for a 10 year period you would need to change the bulbs twice so total cost for 10 years would be 995 x 2 = $1990.

    To find the cost per year, divide the total cost by the number of years:

    1990 / 10 = 199 per year. Round to $200 per year.

    The answer is B.
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