VISUAL BASIC(LISTBOX, ARRAY?,LOOP) : PLEASE HELP ME
Im struggling with my code for college work, i know this isnt right but i spend hours without figuring it out.[CODE[DESIGN][1] here][2]

so im trying to add a certain amount to the loan when the list or lists on the listbox is selected each items in the listbox have differ or same amount. i want the code to work even if i didnt have to choose or highlight any of the item in the listbox.

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

    'Extra Sevices
    		Dim extra As Integer

    		For i As Integer = 0 To ListBox1.SelectedItem.count
    			If ListBox1.SelectedItem = "insurance - O" Or
    					ListBox1.SelectedItem = "Hotel discount -O" Then
    				extra = 500
    			ElseIf ListBox1.SelectedItem = "One payment grace -F" Or
    					ListBox1.SelectedItem = "2-day late payment-F" Or
    					ListBox1.SelectedItem = "Frequent Borrowe benefits -F" Or
    					ListBox1.SelectedItem = "Online reversals -F" Or
    					ListBox1.SelectedItem = "GST waver -F" Then
    				extra = 500
    			ElseIf ListBox1.SelectedItem = "Face to face transactions -S" Or
    					ListBox1.SelectedItem = "Saturday visits -S" Or
    					ListBox1.SelectedItem = "Face to face consultations -S" Or
    					ListBox1.SelectedItem = "Phone reminders -S" Then
    				extra = 200
    			Else
    				extra = 0
    			End If

    			extra = extra + extra

    		Next

<!-- end snippet -->

please im begging anyone to help me with this. even a simple advice appreciated thanks.

  [1]: https://i.stack.imgur.com/IPKaP.png
  [2]: https://i.stack.imgur.com/BYrhQ.png