Loft insulation reduces annual heating costs by 20%.
1 answer:
Answer:
Without isolation annual cost would be 650$
Step-by-step explanation:
Without isolation annual cost is named x and it's worth 100%
With isolation annual cost is 520$ and it's worth (100%-20%) = 80%
Now we will make proportion
x : 520 = 100 : 80
When we multiply external and internal members we get
80 x = 100 · 520 => x = 100 · 520/80 = 650$
x = 650$
God with you!!!
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