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xxTIMURxx [149]
3 years ago
10

Loft insulation reduces annual heating costs by 20%.

Mathematics
1 answer:
Bond [772]3 years ago
3 0

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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