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A small group of employees in a company get viruses on their computers. Every hour, each computer infects one other computer. If it takes 8 hours for 100 computers to be infected, how long would it take for only 50 computers to be infected?

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    A pen and notebook together cost $1.20. If the notebook costs $1.00 more than the pen, how much does the pen cost?

  • math -

    The pen must cost $0.20

  • math -

    $0.10

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