Question

You can upgrade lighting at your factory to LED bulbs that cost $6.95 each and last an average of 5 years. It costs $3 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 $2,000

Answer 1

Option B.

Explanation:

The cost of each LED bulb = $6.95

It costs to change a bulb in labor = $3

Total cost on each bulb = 6.95 + 3 = $9.95

There are 100 lamps to install LED bulbs and change the bulbs.

LED bulb last an average of 5 years. over a 10-year period total bulbs will be used 2 times = 100 × 2 = 200 bulbs

Total cost for 200 bulbs in 10 years = 200 × 9.95

= $1,990

The cost per year =
`(1990)/(10)` = $199 ≈ $200 per year

It will cost $200 per year

Option B.