Denise's cell phone plan is $29.95 per month plus 10 cents 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?

Answer :

This is the total amount Denise was billed for extra minutes

$99.95 - 29.95 = $70

To find out how many minutes:

$70/.10(cents) = 700 minutes

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