Answer:
The total minutes for last month is 300 + 800 = 1100 minutes.
Explanation:
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.
1) If Bob was charged $0.07 per minute, it means the call was within the first 300 minutes. He was charged $21.00 for last month at $0.07per minute. Therefore, he called for:
He called for 300 minutes with $21.00
2) If Bob was charged $0.05 per minute, it means the call was outside the first 300 minutes. He was charged $40.00 for last month at $0.05 per minute. Therefore, he called for:
He called for additional 800 minutes with $40
Therefore, the total minutes for last month is 300 + 800 = 1100 minutes.