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11 April, 19:26

One of Gemma's 5 friends is going to upgrade to a newer device soon. The average cost of their devices will then increase to $663 from the previous $657. How much more expensive than the older one is this newer device?

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  1. 11 April, 20:34
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    Old value of 5 devices = 657

    New value of 5 devices = 663

    Increment cost of 5 devices

    663 - 657

    6

    Therefore the increment for one device

    6 / 5

    1.2
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