Stoney Brooke Has Sales of £890,000 and Cost of Goods

Stoney Brooke has sales of £890,000 and cost of goods sold of £640,000.The firm had a beginning inventory of £36,000 and an ending inventory of £46,000.What is the length of the inventory period?

A) 15.24 days.
B) 15.61 days.
C) 21.19 days.
D) 21.71 days.
E) 23.38 days.