Please show work. Thank you

A company had sales of $20 million, with a net profit margin of 25%. Further, the firm had depreciation expense of $500,000, and increased investment in working capital and fixed assets by $200,000 and $400,000 respectively. You expect free cash flow to grow at 7%, and require a return of 10%. There are 10,000,000 shares outstanding. The per-share value of the companys stock is closest to:

a. $13.91

b. $17.48

c. $21.76