On January 1 of the first year of operation, an investor paid $10,000 for a 20% interest in Biga, an S corporation. During the same year, Biga earned $10,000 taxable income and $2,000 tax-exempt interest. Biga paid dividends totaling $1,000 to its shareholders during the same year. What is the investor's tax basis in the shares of Biga at the end of the year? $4,200 $12,400 $12,200 $10,000