Grants in PowerPoint? WTF?
And you've never used PowerPoint? What rock in Mozambique have you been living under?
Ok, just kidding. Keynote, which is part of iWork '08, can save in PowerPoint format and open PowerPoints. That is PowerPoint format from before Microsoft's newest version, for which they've established a new file format which is driving much of the Windows world batty.
Now, PowerPoint as part of MS Office costs hundreds, and iWork is $80. UNLESS, you're a student at a university and then you can probably get Office for cheaper than iWork.
So, if this bizarre Grant person is using PowerPoint from the latest Office release, then you'll need that. If not, and you can't get the student discount, then Keynote should work and would be much cheaper.
Goodnight.