SOLUTION: an incandesent 60-W lightbulb costs $.50 to buy and $.12 per day to use (24 hrs of usage). A compact fluorescent lamp (CFL) that produces the equivalent amount of ligh costs $2.50

Question 256129: an incandesent 60-W lightbulb costs $.50 to buy and $.12 per day to use (24 hrs of usage). A compact fluorescent lamp (CFL) that produces the equivalent amount of ligh costs $2.50 to buy and $.02 per day to use. Determine the number of days of usage when these costs are equivalent. What is this equivalent cost?
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Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
.50+.12x=2.50+.02x
.12x-.02x=2.50-.50
.10x=2
x=2/.10
x=20 hours the cost will be the same.
.50+.12*20
.50+2.40=$2.90 total cost.
2.50+.02*20
2.50+.40=$2.90 total cost.
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