Gardening has net sales of $500,000, free cash flow of $33,500, depreciation expense of $1,800, interest expense of $900, the tax rate of 35%, additions to net working capital of $2,400, and capital expenditures of $11,700. What is the profit margin of Gardening?
A. 6.24%
B. 8.76%
C. 6.70%
D. 8.98%