=SUMPRODUCT(--(A1:A5="east"),--(B1:B5="type A"),C1:C5)
OR
=SUMPRODUCT(--(A1:A5=E1),--(B1:B5=F1),C1:C5)
...where E1 contains your first criteria, and F1 contains your second.
Hope this helps!
--
Domenic
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