conditional sum?
 

A1= Apple B1 =12
A2= Orange B2 = 52
A3 = Orange B3= 51
A4=Banana B4=53
A5 =grape B5=43
A6=grape B6 = 6
A7=grape B7 = 88



In the C column I'd like to add the number from B column if A column the
same.

The end result will look like:

C1= 12
C2 = 52+ 51 (as A2 and A3 both are orange so add B2 and B3
together)
C3= "" (leave it blank as C2 already did the job)
C4=53
C5 = 43+6 +88 (as A5, A6 and A7 are all grape, so add B5 to B7
together)
C6 = ""
C7 =""


so the outcome will look like this:

A1= Apple B1 =12 C1=12
A2= Orange B2 = 52 C2=103
A3 = Orange B3= 51 C3=
A4=Banana B4=53 C4=53
A5 =grape B5=43 C5=137
A6=grape B6 = 6 C6=
A7=grape B7 = 88 C7=


Any suggesion?

Thanks