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

Algebra ->  Customizable Word Problem Solvers  -> Misc -> 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       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

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?
How to set this up?
Answer by checkley77(12844) About Me  (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.