Please provide your answers to questions a$),$ b$),$ and c$)$ in the text box below. Please clearly label your answers to a$)$ to c$).$ To get full points, you also need to show key steps of calculation in the text box.

You initially had $$10,000$ of your own money in a brokerage account. Then, in this account, you purchased $100$ shares of stock A at $$200$ per share.

a$)$ A month later, the stock price dropped to $$150$ per share. What is the stock return and what is the return to your equity?

b$)$ The minimum maintenance margin required is $30\%.$ At what stock price will you receive a margin call?

c$)$ Suppose the stock price dropped to $$120$ and you received a margin call. How much additional cash do you need to deposit to your account to satisfy the minimum maintenance margin of $30\%?$