15. Calculate the cost of owning and replacing the lights for 5 years (remember you only use them for 30 days each year): 1.Regular:Electricity cost/year for 10 strands:$___________X 5 years = $______________ + Purchase price for all 10 strands X 3 (replaced twice) $__________ = $___________ total 2.LED:Electricity cost/year for 10 strands:$___________X 5 years = $______________ + Purchase price for all 10 strands X 1 (not replaced) $__________ = $___________ total 16. Which strand of Christmas light is the most expensive after 5 years? _____________________