math

A telephone long-distance carrier charges customers $0.99 for the first 20 minutes and then $0.06 for each minute(or any part thereof) beyond 20 minutes. If Mary uses this carrier,how long can she talk for $4.00?

I started off with 0.99x+20+0.06x=4.00. PLEASE help, I don't think I set it up correctly.

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  3. 👁 1,045
  1. You estimate 547= 540 and 92= 90.So now divide 540/90 and there you got your answer.
    60 is your answer

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  2. where do you get 547 and 92 from?

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  3. first 20min
    .99x
    .99*20=19.8
    after 20min
    0.06x+19.8
    $4 is less than 19.8
    so the answer would be .99x=4
    x=4/.99
    x=4.04

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