Help with a code in userform

This program is for a homework and I have most part of it till the part where I have to add $2 or $1 if the hours per months passed the limit. Can someone help me with this code?

This is the code I have till now:

Private Sub Calculate_Click()

'Variables
Dim MC As Double
Dim lblMC As Currency

'Input Validation
If txtHC.Value = "" Then
txtHC = InputBox("Please enter a number of hours")
ElseIf txtHC > 744 Then
txtHC = InputBox("Hours of Access cannot be higher than 744 hours")
End If

'Process
If radA.Value = True Then
MC = 9.95
ElseIf radB.Value = True Then
MC = 14.95
ElseIf radC.Value = True Then
MC = 19.95
End If

Screenshot_2013-11-06-19-17-22-1.jpg

Assuming that radA,B,C are defined elsewhere, where is the definition of "hours per month passed the limit"?

I'm guessing that your radA values determine whether to use $1 or $2... In which case you could define which $ amount to use based on the radA values first in a similar series of if statements that you are using to define MC. Lets say you use Xtra as the extra dollar amount to add to MC. The following code would determine the amount to use if the hours limit is passed.

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Then you could use another if statement at the end which adds the Xtra value if the time limit is passed; something like:

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This would add the predetermined extra $1 or $2 to the MC amount. Does that help?

Variables:
txtHC = textbox Hours of Access (Input)
radA = Package A
radB = Package B
radC = Package C
MC = Mounthly Charge (Output)

• On Package A the charge is $9.95 for 10 hours of access plus $2 for each addicional hour.
• On Package B the charge is $14.95 for 20 hours of access plus $1 for each addicional hour.
• On Package A the charge is $19.95 for unlimited hours of access.

There's also a checkbox to check if the client is from a NonProfit Organization that gives the client 20% of discount on all the packages. The user must enter the hours of access, select a package and the check the checkbox if the client is from a NonProfit Organization or leave it blank if is not. The Output must be the monthly charge.

I don't know how to make possible to add $2 or $1 depending on the package and the hours of access. For example:

Client 1: Package A, 5 hours, nonprofit $7.96
Client 2: Package B, 25 hours $19.95

On the client 2 it has 25 hours of access and it was selected package B meaning that there are 5 hours of access addionals that must be charge $1 each but I don't know how to do that or the 20% of discount.