Answer below questions:

1. How much cash or risk-free securities would a speculator have to deposit in a commodity account if he goes long in one September T-bond futures contract at 95 and the initial margin requirement is 5%?
2. At the end of the trading day, and the settlement index value on the same T-bond became 94.5, how much is the account value?
3. If the maintenance margin is set to 98% of the initial margin, what should the speculator do if she/he does not want to close the position?