The Polyana Shoe Store Had Sales Last Year of $50,000,000

The Polyana Shoe Store had sales last year of $50,000,000 based upon a cost of goods sold of $40,000,000. Polyana also has inventory, accounts receivable, and accounts payable of $5,000,000, $7,000,000, and $9,000,000, respectively.
-What is Polyana's average age of inventory?

A) .125 days
B) 8.000 days
C) 36.500 days
D) 45.625 days