Newbie Question about IB Margin

I'm about to start trading options with IB. However, I'm having problems understanding their margin rules regarding spreads. Say, I'm want a position:

Long Dec 92 Call at 14
Short Dec 80 Put at 5.6

Aside from the difference in the prices, how would would I need as margin requirement? Could someone show me how to calculate this? Thanks.
 
Back
Top