Mark is shorting 73 shares of Moderna (tic:MRNA). When Mark opened the position, the price of MRNA was $78.20. On the first day of trading, the price of MRNA was $68.06. On the second day of trading the price of MRNA was $59.07. On the third day of trading, the price was $78.90. The initial margin is 63%. The maintenance margin is 2%.

What is Mark's equity at the end of the third day, before any margin call, if any?