How to calculate average unit cost by type?

Question

Generic example:

Total Cost $500,000

Total Widgets 5,500

Total Widget A 4,000

Total Widget B 1,500

How do I get unit cost for widget A & widget B?

Answer 1

A. 4000 / 5500 = 73%

B. 1500 / 5500 = 27%

A. .73 x $500,000 = $365,000 / 4,000 = 91.25 per unit

B. .27 x $500,000 = $135,000 / 1,500 = $90.00 per unit.

Edit:

Actually, in this generic example, the unit costs would be equal. (Differences shown are due to rounding only.)  You would need costs for the various types of Widgets.