Simple pass fail function in excel

Hello everyone this is my first post in these forums hopefully you guys could offer me some advice I have never done programming before and we had to take it in my computers business functions course.

I have to create a simple function where the program takes a grade either 100 - 50 or 49 -0 the program will then output "pass" for the first option and "fail" for the second.

When I use the function it says #VALUE! I cant figure out what is wrong. I am using excel 2010.

Function passfail(grade As Double) As Double
If grade >= 50 Then
passfail = ("Pass")
Else
If grade < 50 Then
passfail = ("Fail")
End If
End If

End Function

Thank you for any help you can offer

Sorry about the Quote tags next time I will use the proper tag, but thank you that helped a lot and now I have a working program I really appreciate it