How does a star form?
2 answers:
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Answer: Payback time = 0.0075
Explanation: Since payback time is calculated as:
payback time =
First determine the installation cost:
100 mm thick insulation covers 8.3 m². Then 300 mm covers 24.9 m².
To cover 8.3m² costs £20. Then, the cost to cover 24.9 m² is:
cost =
cost = £60
The cost of putting the insulation is £120, so the total cost is:
total cost = £60 + £120
total cost = £180
Savings per year per 100 mm thick is £80. For 300 mm, the value of annual savings is:
savings =
savings = 240
payback time =
payback time =
payback time = 0.75