Some loft insulation costs £200. It reduces the person’s electricity bill from £750 per year to £650 per year.
Payback time = Cost / annual saving
Use the equation above to calculate the Payback time. Show your working.
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Answer:
Professional installation cost Around £250
Annual saving per year Around £15
Payback time 16 years
DIY installation cost £120-£200 *
DIY payback time 5 to 8 years
Explanation:
the same
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