Performance of Buffets investments. Consider exhibit 5. One of the stocks owned by BRK is Coca-Cola (KO) (Apparently Buffett drank five cans of Chery Coke each day!), which Buffett purchased on January 1, 1988 for $2.45 per share. On January 1, 2018, the shares were worth $42.70 (including dividends). What is the simple (Arithmetic, AA) and compound (Geometric, GA) average annual returns for this investment?