Answer:
$650
Step-by-step explanation:
Let x represent curtleys original annual heating cost.
We have been given that Loft insulation reduces annual heating costs by 20%.
So the cost after 20% reduction would be 80% of original cost that is @@MATH_TOKEN_0@@.
We have been given that after he insulated his loft, curtleys annual heating cost was £520. We can represent this information in an equation as:
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Therefore, Curtley's annual heat costing would have been $650, if he had not insulated his loft.
