At the beginning of a trading day, you short sold 500 shares of Jasper stock at $41 a share, and 200 shares of Casper at $20 a share. Your initial margin is 60% and the maintenace margin is 40%. At the end of the trading day, the closing price of Casper share is $15 a share, and your margin balance is 45%. What is the closing price of Jasper share at the end of the trading day?