How to calculate the average sales price

[doublediamond111]

I have a list of 5 buildings each with different unit counts, and an average price sold for each building. How can I get the average price of all units sold?

A B
312 $1000
54 $1010
35 $1835
32 $1028
53 $1937

 

[njimack]

=sumproduct(a1:a5,b1:b5)/sum(a1:a5)