HELP NEEDED WITH SOME BASIC CODING

Question

I am learning Visual Studio and need to code this:-

If Radio Button 1 = £100

If Radio Button 2 = £150

If Radio Button 3 = £175

if check box 1 is checked money answer if divided by 2

text box 1 = answer

Just to clarify in English terms I have been given an task in college to create a programme for an imaginary leisure club that new members information can be input, name address etc I have completed this part. Also which type of membership is required,  I have inserted radio buttons for this. radio button 1 is for single membership @ £100 radio button 2 is for a couple @ £150 and radio button 3 for family @£175. If they are a member of another club they get 50% discount which I am using a "check box". Then the amount due will appear in a "text box".  The £ not necessary it is just habit on my behalf. 

Can anyone help with this? 

Thanks in advance.

Sue