. Loft insulation reduces annual heating costs by 20%. After he insulated his loft, Curtley's annual heating cost was £520. Work out wha t Curtley's annual heating cost would have been if he had not insulated

. Loft insulation reduces annual heating costs by 20%. After he insulated his loft, Curtley's annual heating cost was £520. Work out wha t Curtley's annual heating cost would have been if he had not insulated his loft.

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. Loft insulation reduces annual heating costs by 20%. After he insulated his loft, Curtley's annual heating cost was £520. Work out wha t Curtley's annual heating cos…

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