The initial margin requirement on a stock purchase is 50%. You fully use the margin allowed to purchase 10 shares of Tesla at $350. Call money rate is 8% p.a. and interests are compounded monthly. Maintenance margin is 30%. a) Calculate the holding period percentage return if the price drops to $330 four months later. (5 marks) b) Calculate the price level that you can receive margin call (Ignore margin interest). (3 marks) c) Calculate the additional cash required in the margin account so as to maintain margin level at 45% after receiving margin call. (3 marks) d) Describe and explain the trade-off between using margin account and cash account for stock investment (4 marks)