An investor purchased a total of 8000 shares of stocks A and B at a total cost of $20000. How many shares of stock A did the investor purchase? (1) The investor purchased thrice as many shares of stock A as stock B. (2) Stock A costs $3 and stock B costs $1.   Statement (1) ALONE is sufficient, but statement (2) ALONE is not sufficient.   Statement (2) ALONE is sufficient, but statement (1) ALONE is not sufficient.   BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.   EACH statement ALONE is sufficient.   Statements (1) and (2) TOGETHER are NOT sufficient.   Hint Half-n-half Clue