This is to demostraight how easy to create a generic form with payment calculated by the form selection.

• The payment is calculated based on the formula and the form value.
  The formula is: ([1]*70 [2] [3]*[4])*(5)
• The settings for above form is
  
• Click Submit to see the payment amount calculated by your selection
• You can choose "Bank Transfer" to test the function (offline payment)
• If you choose "Paypal", do not pay, it is real account.