What is marginal cost per minute of making two more calls

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Mary buys cell-phone services from a company that charges $30 per month. For that $30 she is allowed 600 minutes of free calls and then pays 25 cents per minute for any calls above 600 minutes. Mary has used 300 minutes this month so far. What is her marginal cost per minute of making two more calls lasting 10 minutes each? $2.50 25 cents 4 cents Zero

Reference no: EM131298161

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What is marginal cost per minute of making two more calls : Mary buys cell-phone services from a company that charges $30 per month. For that $30 she is allowed 600 minutes of free calls and then pays 25 cents per minute for any calls above 600 minutes. Mary has used 300 minutes this month so far. What is her..

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