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17 January, 15:41

Unit Rates

National Mobile-300 texts for $9.99

Airtime-500 texts for 17.99

Which is the better buy?

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Answers (1)
  1. 17 January, 18:58
    0
    Simply divide each cost by its corresponding number of units to get the unit rate.

    National Mobile = 9.99/300 = 0.0333 cost per text

    Airtime = 17.99/500 = 0.03598 cost per text

    National Mobile is cheaper than Airtime. It is 0.00268 cheaper per text.

    Compare:

    0.0333 x 500 text = 16.65 of National Mobile vs 17.99 of Airtime.

    0.03598 x 300 text = 10.794 of Airtime vs 9.99 of National Mobile.
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