If I buy a stock for 3.35 X 1000 shares and bought more for 3.45 X 500 shares, how much is my average cost?
$3.35 * 1,000 = $3,350 $3.45 * 500 = $1,725 1725+3350 = $5,075 $5,075 / 1,500 shares = Your Answer Go do it yourself so you'll learn it better (and don't forget commissions)