a fixed mo fee of 22.00 up to 510 min. then .05 per min thereafter if i use less than 510 min

i still pay 22.00 per month based on 100 min/ 240 min. 540 min.

23.50 per mo for 540 min

To calculate the total monthly cost based on your usage, you need to consider two scenarios:

1. If your monthly usage is less than or equal to 510 minutes:
In this case, you will pay a fixed monthly fee of $22.00. So regardless of whether you use 100 minutes, 240 minutes, or 540 minutes, your monthly cost will still be $22.00.

2. If your monthly usage exceeds 510 minutes:
In this scenario, you will pay a fixed monthly fee of $22.00 plus an additional charge of $0.05 per minute for every minute used over 510. Let's assume your usage is 540 minutes, as you mentioned.

First, find the number of minutes that exceed 510:
540 minutes - 510 minutes = 30 minutes

Next, calculate the additional charge for these extra minutes:
30 minutes * $0.05/minute = $1.50

Add the additional charge to the fixed monthly fee:
$22.00 + $1.50 = $23.50

Therefore, if you use exactly 540 minutes, your monthly cost will be $23.50.