Problem 16 (1997 AJHSME)

Penni Precisely buys \100$worth of stock in each of three companies: Alabama Almonds, Boston Beans, and California Cauliflower. After one year, AA was up$20%$, BB was down$25%$, and CC was unchanged. For the second year, AA was down$20%$from the previous year, BB was up$25%$from the previous year, and CC was unchanged. If$A$,$B$, and$C$ are the final values of the stock, then