Indicate on the blanks below the letter of the type of activity (O = operating activity, F = financing activity, I = investing activity, N = noncash transaction) each of the following transactions represents. Firm sold 8,000 shares of its own common stock for cash. Sold $200,000 worth of products for cash. Paid $120,000 dividend. Received $1,500 in interest income. Exchanged 6,000 shares of stock for 15-year bonds. Paid $121,000 to the U.S. Treasury for income taxes