Suppose you want to short$-$sell $1$ share of BRK$.$A which is traded at

$$600,000($i$.$e$.,$ Berkshire Hathaway$).$ The initial margin required is $50\%$ and

the maintenance margin is $30\%.$ At what price level you would receive a

margin call?

$650,000$

$640,000$

$690,000$

$620,000$