AAA's inventory turnover ratio is $20$ based on sales of $$25,200,000.$ The firm's current ratio equals $5\mathrm{.}42$ with current liabilities equal to $$500,000.$ If the firm's cash and marketable securities equal $$406,000,$ what is the firm's days sales outstanding?

$15\mathrm{.}12$

$33\mathrm{.}37$

$39\mathrm{.}25$

$21\mathrm{.}00$

$13\mathrm{.}81$