With beginning inventory at cost of $$9,000,$ ending inventory at cost of $$7,000,$ net sales of $$51,000,$ and cost of goods sold of $$46,000,$ the inventory turnover at cost to the nearest hundredth is:

Group of answer choices

$5\mathrm{.}57$

$7\mathrm{.}57$

$5\mathrm{.}75$

$7\mathrm{.}55$

None of these