Rodomir bought 5751 shares at $86.22 and has an initial and maintenance margin of 30% on his account.

When he opened the account, 11 months ago, he just met the minimal margin requirements.

The cost of the loan for the margin trade was 6.5% EAR. If any margin calls happen, he must respect the new loan balance.

Given that the stock has just attained the price of $11.55, how much of a margin call (in dollars/$) must Rodomir meet?

If there is no margin call, simply put the value zero.