Porter Industries Inc. began 2018 with total stockholders equity of $40 million. Due to a large acquisition of treasury stock and the payment of a $10 million cash dividend, the company ended that year with stockholders equity of only $5 million. For the year ended December 31, 2018, Porter reported net income of $10 million. What is the company's return on equity?

• 10%

• 2.25%

• 44.4%

• Not enough information to determine