Vlookup

[ilmc]

Hello, I'm currently taking a basic college information systems course and I'm having difficulty with the VLOOKUP function. I need to calculate letter grade equivalents. I used breakpoints for the table I'm referring to. I've tried copying the range and referring to my text book for the correct forumla, but I can't figure out what I'm doing wrong. What am I missing? Not sure if this matters, but the table is in a separate worksheet.

Any assistance would be greatly appreciated. I'm banging my head against the wall over this, but it's probably a very simple error on my part. If you need additional information, I'll do my best to provide it.