Final answer:
The student's question involves calculating the total monthly costs of three different long-distance phone plans at usage levels of 100, 300, and 500 minutes. Plan A charges per minute, while Plans B and C include fixed monthly fees with additional charges for minutes exceeding their respective caps. The analysis shows the cost-effectiveness of each plan varies depending on the usage level.
Step-by-step explanation:
The student's question is asking to compare long-distance phone plans based on the cost for 100, 300, and 500 minutes of usage.
For Plan A, the cost will be 9 cents per minute. Therefore, the costs at different minute levels are:
- 100 minutes: $9.00 (100 minutes * $0.09 per minute)
- 300 minutes: $27.00 (300 minutes * $0.09 per minute)
- 500 minutes: $45.00 (500 minutes * $0.09 per minute)
For Plan B, there is a flat fee of $15 for up to 300 minutes, and 7 cents per minute thereafter. The costs would be:
- 100 minutes: $15.00 (fixed monthly fee)
- 300 minutes: $15.00 (fixed monthly fee)
- 500 minutes: $29.00 ($15 flat fee + 200 minutes overage * $0.07 per minute)
Finally, for Plan C, there's a $24 monthly fee for up to 440 minutes, plus 6 cents per minute thereafter. The costs would be:
- 100 minutes: $24.00 (fixed monthly fee)
- 300 minutes: $24.00 (fixed monthly fee)
- 500 minutes: $27.60 ($24 flat fee + 60 minutes overage * $0.06 per minute)
Comparing these costs, it seems that Plan A is best for low usage (100 minutes), Plan B is cost-effective for moderate usage (300 minutes), and Plan C tends to be more reasonable for higher usage levels (500 minutes).