D$$e Trader opens a brokerage account and purchases $300$ shares of Internet Dreams at $$40$ per share.

She borrows $$4,000$ from her broker to help pay for the purchase. The annual interest rate on the loan is $8\%.$

$"$A$.$ If the share price falls to $$30$ per share by the end of the year, what is the remaining margin in her account? $($Keep no decimal place.$)$

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$<=$ Select Answer

B$.$ If the maintenance margin requirement is $30\%,$ will she receive a margin call? C$.$ What is the rate of return on her investment? $($Negative value should be indicated by a minus sign. Round your answer to $2$ decimal places.$)$