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Last month a phone company charged $ 0.07 per minute for the

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Last month a phone company charged $ 0.07 per minute for the first 300 minutes of calling time and $0.05 per minute for each minute of calling time in excess of the first 300 minutes . For how many minutes of calling time was Bob charged by the phone company last month?
1) Last month the phone company charged Bob $21.00 for his calling time that was charged at $0.07 per minute.
2) Last month the phone company charged Bob $40.00 for his calling time that was charged at $0.05 per minute.

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