The Sylvania Super Saver 75-W light uses 20 W, produces 1,280 lumens, and costs $4.49. As an alternative, a generic 75-W incandescent light bulb costs $0.40 and produces 1,200 lumens.
a. Compare the performance of each light by calculating the efficacy for each light.
b. Estimate how much it would cost to run each light for 4 h per day for 300 days in a
year.
Assume electricity costs 9 cents per kWh.
A. 
B. 
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