This a 2 part question:

a) Sam bought 7400 shares of a stock at $71 and has a initial margin of 30% and the maintenance margin is also 30%. The stock just dropped to $34, is there a margin call and if so, what is the margin call dollar amount?

b) let's assume there is a margin call and the margin interest rate is 5% EAR, how much is the margin call when you include owing interest on the loan?