For example, when a naked call option is written in the US$,$ the margin is the greater of:

$1-$A total of $100\%$ of the proceeds of the sale plus $20\%$ of the underlying share price less the amount $($if any$)$ by which the option is out of the money

$2-$A total of $100\%$ of the proceeds of the sale plus $10\%$ of the underlying share price