Selected Balances from a Company's Financial Statements Are Shown Below

Selected balances from a company's financial statements are shown below:
$\begin{array}{|l|c|c|c|} \hline& \begin{array}{c}\text { Dec. 31, } \\2013\end{array} & \begin{array}{c}\text { Dec. 31, } \\2014\end{array} & \begin{array}{c}\text { For the } \\\text { Year 2014 }\end{array} \\\hline \text { Merchandise inventory } & \$ 15,000 & \$ 20,000 & \\\hline \text { Accounts payable } & 32,000 & 26,000 \\\hline \text { Salaries payable } & 4,400 & 3,000 \\\hline \text { Accounts receivable } & 24,000 & 21,000 \\\hline \text { Total assets } & 234,000 & 286,000 \\\hline \text { Sales (all on credit) } & & & \$ 312,000 \\\hline \text { Cost of goods sold } & & & 165,600 \\\hline \text { Salaries expense } & & & 48,000 \\\hline \text { Other expenses } & & & 75,000 \\\hline \text { Net income } & & & 24,000\\\hline\end{array}$ Use the information above to calculate the following current year ratios:
(a) 2014 inventory turnover.
(b) Days' sales uncollected at Dec. 31, 2014.
(c) 2014 profit margin.
(d) 2011 return on total assets.