For a particular model of car, bought for 14 750, the second-hand value after t years is

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For a particular model of car, bought for £14 750, the second-hand value after t years is given fairly accurately by the formula

price = e9.55-0.111

The running costs of the car increase as the car gets older, so after t years the annual running cost is £(917 + 163t). When should it be replaced?

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