$600$ shares are purchased on margin at the beginning of the year for $$40$ per share. The initial margin requirement was $55\%.$ Interest of $10\%$ was paid on the margin loan and no margin call was ever faced. A dividend of $$2$ per share is received.

$($a$).$ Calculate the annual return if the stock was sold for $$45$ per share at the end of the year

$($b$).$Calculate the annual return if the stock was sold for $$25$ per share at the end of the year.