Bill Campbell invested $$3,100$ and borrowed $$3,100$ to purchase shares in Kellogg. At the time of his investment, Kellogg stock was selling for $$57$ a share.

$($a$)$ If Bill paid a $$57$ commission, how many shares could he buy if he used his $$3,100$ and borrowed $$3,100$ on margin to buy Kellogg stock? $($Round your answer to $2$ decimal places.$)$

Number of shares

$($b$)$ Ignoring buying commission, Assuming Bill did use margin, paid a $$55$ total commission to sell his Kellogg stock, and sold his stock for $$60$ a share, how much profit did he make on his Kellogg investment? $($Round your answer to $2$ decimal places.$)$

Total profit after commissions