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?

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1. You estimate 547= 540 and 92= 90.So now divide 540/90 and there you got 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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