Mathematics, 15.07.2019 23:00 tporter00
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?
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