Scribble, Inc. has sales of $86,000 and cost of goods sold of $70,000. The firm had a beginning inventory of $16,000 and an ending inventory of $18,000. What is the length of the days' sales in inventory?

83.43 days

67.91 days

93.86 days

76.40 days

I keep getting 88.6428571429 using [17,000/70,000]*365. What am I doing wrong and what is the correct answer. Thanks!