看了半天, 楼主的重点都没抓住,

卖100 个HOOD Put contracts, strike price: $105
你需要帐户有多少cash在帐户里吗, 否则broker都不让你这么操作.
100 contracts =100*100=10000 股, how much cash you need in the account = 105*10000=105 万 美刀
你必需有105万cash(闲钱)在帐户里, Broker才让你这么一笔操作.