Jester Corporation's most recent income statement appears below:

Income Statement
Sales (all on account)	$ 210,000
Cost of goods sold	125,000
Gross margin	85,000
Selling and administrative expense	41,000
Net operating income	44,000
Interest expense	11,000
Net income before taxes	33,000
Income taxes (30%)	9,900
Net income	$ 23,100

The beginning balance of total assets was $150,000 and the ending balance was $147,000. The return on total assets is closest to:

a. 20.7%

b. 29.6%

c. 22.2%

d. 15.6%