Being that there is 6 exchanges to trade on in CA for the Market Makers,Looks like 79 broker saw a bid higher on another exchange(s).Thus the trader bought the 8500 lower and sold higher on another exchange.
John buys 100 shares of stock at $100 per share. The price goes up by 10% and he sells 50 shares. Then, prices drop by 10% and he sells his remaining 50 shares. How much did he get for the last 50? a. $5000 b. $5500 c. $4900 d. $5050 e. $4950