A Stockbroker Placed the Following Order for a Customer

A stockbroker placed the following order for a customer:
-50 shares of Kaiser Aluminum preferred at $104 a share
-100 shares of GTE preferred at $25 1/4 a share
-20 shares of Boston Edison preferred at $9 1/8 a share
What is the weighted arithmetic mean price per share?

A) $25.25
B) $79.75
C) $103.50
D) $42.75
E) Weighted mean cannot be computed for this data set.