13 Bill Campbell Invested $4,000 and borrowed $4,000 to purchase shares in Walmart. At the time of investment, Walmart stock was selling for $62 a share 071 oints a) Ir Bill pald a $30 commission, how many shares could he buy if he used only his own money and did not use margin? (Round your answer to 2 decimal places) Number of shares (b) IH Bill pald a $50 commission, how many shares could he buy If he used his $4,000 and borrowed $4,000 on margin to buy Walmart stock? (Round your answer to 2 declmal places Pron Number of shares (c) Assuming Bill did use margin, paid a $90 total commission to sell his Walmart stock, and sold his stock for $75 a share, how much profit did he make on his Walmart investment? (Use the number of shares computed In part (b) rounded to 2 decimal places. Round your final answer to 2 declmal places Total proft ofter