Answer:
$3,000.
Explanation:
Given that, the margin in an arbitrage account is 5% minimum maintenance on the long side under FINRA rules.
Also, in this case, there is no Regulation T requirement, since the customer has no risk, which means hs net position = "0."
Therefore, given that, the market value of the securities is $150 * 400 = $60,000
Then, the minimum margin which is 5% = $3,000.
Additionally, the customer can borrow the remaining $57,000.
Hence, the right answer is $3,000