Suppose that Xtel currently is selling at $$50$ per share. You buy $900$ shares using $$36,000$ of your own money, borrowing the remainder of the purchase price from your broker. The rate on the margin loan is $7\%.$

a$.$ What is the percentage increase in the net worth of your brokerage account if the price of Xtel immediately changes to $($a$)$ $$56$; $($b$)$ $$50$; $($c$)$ $$44?($Leave no cells blank $-$ be certain to enter $"0"$ wherever required. Negative values should be indicated by a minus sign. Round your answers to $2$ decimal places.$)$

a$.$ Percentage gain

$\%$

b$.$ Percentage gain

$\%$

c$.$ Percentage gain

$\%$