An Internet service provider has three different subscription packages for its customers: Package A: For $9.95 per month 10 hours of access are provided. Additional hours are $2.00 per hour.

Package B: For $13.95 per month 20 hours of access are provided. Additional hours are $1.00 per hour. Package C: For $19.95 per month unlimited access is provided

An Internet Service Provider has three different subscription offers for its customers:

To determine which package is the best option based on usage, we need to compare the cost of each package given the expected monthly usage.

Let's consider three scenarios for monthly usage:
1. Less than 10 hours
2. Between 10 and 20 hours
3. More than 20 hours

For scenario 1:
If the monthly usage is less than 10 hours, Package A is the most cost-effective since it provides 10 hours at $9.95 per month. There are no additional charges for this scenario.

For scenario 2:
If the monthly usage is between 10 and 20 hours, Package B becomes the best choice. It provides 20 hours at $13.95 per month, and any additional hours are charged at $1 per hour. Let's calculate the cost for this scenario:
Cost of Package B: $13.95
Additional hours: (Total hours - 20) * $1

For example, if the usage is 15 hours:
Cost of Package B: $13.95
Additional hours: (15 - 20) * $1 = -$5 (no additional cost)
Total cost = $13.95

For example, if the usage is 18 hours:
Cost of Package B: $13.95
Additional hours: (18 - 20) * $1 = -$2 (no additional cost)
Total cost = $13.95

Therefore, Package B is the better choice for this scenario.

For scenario 3:
If the monthly usage exceeds 20 hours, Package C is the most cost-effective since it provides unlimited access at $19.95 per month. There are no additional charges for this scenario.

To summarize:
- For usage less than 10 hours, choose Package A.
- For usage between 10 and 20 hours, choose Package B.
- For usage more than 20 hours, choose Package C.

Remember to check the terms and conditions of the Internet service provider and confirm if there are any other limitations or conditions for each package.