I am by no means skilled in Excel but I need help with a formula. I am using
the spreadsheet to calculate product prices based on my cost. My sister
helped me originally with the first two formulas and they still work
perfectly but I can't seem to make new formulas using the same concept. The
variable that I don't understand is $AA$x (x being 1,3,6 or 8).

Here are the two formulas that do work:

=IF((F2/64)*16<5,$AA$1,(F2/64*16))
=IF((F2/16)*8<8,$AA$3,(F2/16*8))

Now here are the three formulas I want to make work:
=IF(((F2/64)*16)*3<18,$AA$3,((F2/64)*16)*3)
=IF((F2/2)*3<26,$AA$3,(F2/2)*3)
=IF((F2*2.5)<38,$AA$3,(F2*2.5))


The 3 after $AA$ seems to be the key but I don't know what it means nor can
I find $AA$ in Excel Help anywhere.

Any help please?