Finding package details.

I知 working on an excel (2010) sheet that I want excel to look for the letter following the item# and if it ends in B then return one value if it ends is C return another value.

Example
A1 contains item 0123456789C and the quantity ordered in cell E8/D8= less than or equal to 20 (cartons that痴 what the C stands for) then return item should be B pack or Bulk pack. I知 not sure I知 going about this the correct way so any alternative suggestions would be great. This is the formula I知 currently using. =IF(ISNUMBER(SEARCH("C",B8)),E8/D8,0)=AND(IF(E8/D8>20,E8/D8,"B Pack Needed")). But it痴 returning a false statement for 21/1.
Attached is a copy of the excell form.