A new 13 W CFL costs $4.73 and a new 80 W incandescent bulb costs $0.49....

Question

Question

Answer 1

Answer #1

Average operation time per day = 947/365 hours = 2.5945 hours

Thus kWh of CFL per day = 2.5945*13/1000 = 0.0337285 kWh

kWh of bulb per day = 80*2.5945/1000 = 0.20756 kWh

Thus saving per day = $0.3*(0.20756-0.0337285) = $0.0521

Thus payback time = (4.73-0.49)/0.0521 = 81.38 days say 82 days.

Answer 2

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