Bobby bought two shares of stock, which he sold for $96 each. If he had a profit of 20 percent on the sale of one of the shares but a loss of 20 percent on the sale of the other share, then on the sale of both shares combined Bobby had?
a profit of $10
a profit of $8
a loss of $8
a loss of $10
neither a profit nor a loss
是各自成本为基准,不是以售价为基准
成本的20%