qThe PM Computer Company makes build$-$to$-$order $($BTO$)$ computers at its distribution center year round. The following table shows the average value $($in $ millions$)$ of component parts, work$-$in$-$process, and finished computers at the DC for the past four years.

YFAR

Component parts

Work$-$in$-$process

Finished computers

Cost of goods sold

$$20\mathrm{.}5$

$4\mathrm{.}2$

$3\mathrm{.}6$

$226\mathrm{.}0$

$2$

$27\mathrm{.}8$

$6\mathrm{.}7$

$7\mathrm{.}2$

$345\mathrm{.}0$

$30\mathrm{.}8$

$7\mathrm{.}1$

$8\mathrm{.}6$

$517\mathrm{.}0$

$37\mathrm{.}3$

$9\mathrm{.}5$

$10\mathrm{.}1$

$680\mathrm{.}0$

a$.$ Determine the number of inventory turns and the days of sup for each year.

b$.$ As the company has grown, does it appear that the compan supply chain performance has improved? Explain your answe