kaylas cell phone plan as a fixed fee of $45

Huh?

To calculate the monthly cost of Kayla's cell phone plan, we need the additional information about the plan. Specifically, we need to know if there are any additional charges or fees associated with the plan, such as taxes or data overage charges. If the fixed fee of $45 is the only cost, then the monthly cost is $45.

However, if there are any additional charges, you would need to include them in the calculation. For example, if there's a 10% tax applied to the base fee of $45, you would calculate the tax amount as:

Tax Amount = $45 * 0.10 = $4.50

To find the total cost, you would add the base fee and the tax amount:

Total Cost = Base Fee + Tax
Total Cost = $45 + $4.50 = $49.50

So, in this case, the monthly cost of Kayla's cell phone plan would be $49.50.

It's important to note that this is a general example, and the actual costs and fees for a cell phone plan can vary. You should always refer to the specific terms and conditions of the plan or contact the service provider for accurate information.