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2 March, 20:39

Phone Company A charges a monthly fee of $42.50, and $0.02 for each minute talk time. Phone company B charges a monthly fee of $25.00, and $0.09 for each minute of talk time.

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  1. 2 March, 22:42
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    We need to call for x minute

    + Phone Company A charges a monthly fee of $42.50, and $0.02 for each minute talk time. So we have to spend: $42.50 + $0.02x

    + Phone company B charges a monthly fee of $25.00, and $0.09 for each minute of talk time. So we have to spend: $25.00 + $0.09x

    We solve for x: $42.50 + $0.02x> $25.00 + $0.09x

    or $42.50 - $25.00 > $0.09x - $0.02x

    and we have $0.07x<$27.50

    or x< 27.50:0.07 and x< 393.86

    The answer is:

    If we have to call much time, at least 394 minutes, we should choose A

    If not, choose B
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