I upvote very quickly if answer is correct!

Bill Campbell invested $3,800 and borrowed $3,800 to purchase shares in Kellogg. At the time of his investment, Kellogg stock was selling for $54 a share. Note: There were no commissions to buy or sell this stock. a. How many shares could he buy if he used his $3,800 and borrowed $3,800 on margin to buy Kellogg stock? Note: Round up your final answer to the nearest whole unit. b. Assuming Bill did use margin, sold his Kellogg stock $61 a share, how much profit did he make on his Kellogg investment? Note: Round up your intermediate value of "Total shares" to the nearest whole unit. Round your final answer to 2 decimal places