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Denise has a fixed cost per month of $29.95. Subtract the fixed cost from her monthly bill of $99.95 to get a timed cost of $70.00.

At 10c per minute she has been charged for 7000/10 = 700 minutes of chargeable time.

She does not get charged for the first 300 minutes so she has used her phone for 300 + 700 = 1000 minutes. (16 2/3 hours)

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Q: Denise's cell phone plan is 29.95 per month plus 10 per minute for each minute over 300 minutes of call time Denise's cell phone bill is 99.95 for how many minutes was she billed?
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