See attached form-fill PDF. There are four options in 'Option 1" and four options in 'Option 2" Only one of these eight check=boxes can be selected at any time.
Need somebody clever to make sure that the fields 'Current Rate" and 'Interest to be Paid in advance' are only visible when the matching check-box is ticked. (ie only one line visible at a time.)
'Interest to be Paid in Advance' is a calculation field and the result of 'Option 1' or 'Option 2' 'Fix a PORTION of the loan balance outstanding' x 'Current Rate'