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12 March, 16:16

For his phone service, Michael pays a monthly fee of $16, and he pays an additional $0.04 per minute if use. The least he has been charged in a month is $69.52.

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  1. 12 March, 16:35
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    Answer: The least number of minutes that he has used his phone in a month is 1248

    Step-by-step explanation:

    Let m represent the number of minutes that he used his phone in a month.

    For his phone service, Michael pays a monthly fee of $16, and he pays an additional $0.04 per minute if use. This means that if he used m minutes in a month, the total cost would be

    16 + 0.04m

    The least he has been charged in a month is $69.52. This means that

    16 + 0.04m ≥ 65.92

    0.04m ≥ 65.92 - 16

    0.04m ≥ 49.92

    m ≥ 49.92/0.04

    m ≥ 1248 minutes
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