Bill Campbell invested $4,000 and borrowed another $4,000 to purchase shares in Wal- Mart. At the time of his investment, Wal-Mart stock was selling for $48 a share. (a)lf Bill paid a $30 commission, how many shares could he buy if he used only his own money and did not use margin? (Round your answer DOWN to the nearest whole share.) Number of shares (b)lf Bill paid a $50 commission, how many shares could he buy if he used his $4,000 and borrowed $4,000 on margin to buy Wal-Mart stock? (Round your answer DOWN to the nearest whole share.) Number of shares (c)Assuming Bill did use margin, paid a $140 total commission to buy and sell his Wal- Mart stock, and sold his stock for $53 a share, how much profit did he make on his Wal-Mart Investment? (Round the number of shares DOWN to the nearest whole number. Omit the "$" sign in your response.) Total profit after commissions $