I would like to show you the syntax for VBA I debugged successfully:

Dim strHours As String, strRate As String
Dim hours As Single, rate As Single, gross As Single

strHours = InputBox("Enter the hours")
strRate = InputBox("Enter the rate")

hours = Val(strHours)           'converts a string to a number
rate = Val(strRate)

gross = hours * rate

MsgBox ("The gross pay is " & Str(gross))  'Str(gross) converts a number to
a string

Tax = Val(25 / 100 * gross)

NetPay = Val(gross - Tax)

Dim FirstName As String
FirstName = InputBox("Enter the First Name")
MsgBox "The First Name is John"

Dim LastName As String
LastName = InputBox("Enter the Last Name")
MsgBox "The Last Name is Smith"

Dim FullName As String
FullName = InputBox("Enter the First Name" + "Enter the Last Name")
MsgBox "The Full Name is John Smith"

The following syntax that was supposed to display the MsgBox "Pay details
for John Smith are Gross = 400, Tax = 100, Net = 300" is incorrect:

Gross = "Gross = (gross)" + Tax = "Tax = (Tax)" + NetPay = "NetPay =
(NetPay)"")

Yours Sincerely