Degollado Corporation's most recent income statement appears below:

Sales (all on account)	$ 140,000
Cost of goods sold	60,000
Gross margin	80,000
Selling and administrative expense	30,000
Net operating income	50,000
Interest expense	10,000
Net income before taxes	40,000
Income taxes (30%)	12,000
Net income	$ 28,000

The beginning balance of total assets was $200,000 and the ending balance was $220,000.

Required: Compute the return on total assets.