Suppose Elone Musk opens a brokerage account and purchases $300$ shares of X Inc. at $$40$ per share. He borrows $$4,000$ from his broker to help pay for the purchase. The interest rate on the loan is $8\%.$

If the share price falls to $$30$ per share by the end of the year, what is the remaining margin in his account?

Group of answer choices

$$4,680$

$$4,320$

$$4,000$

$$9,000$

None of the above