3. a. Amina buys 20,000 shares of Ecobank at a price of C5 per share. She decides to borrow C40,000 to complete the purchase. ii. Calculate the initial margin and find its percentage. iii. Suppose the maintenance margin is 30%, what is the price below which she will receive a margin call? iv. Assume price drops suddenly to C2.75 per share, how much cash will Amina be required to add in order to hold on to her position? b. i. Sam invests 35% of his money in stock A, 20% in stock B and the remaining amount in stock C. Stock A has a beta of 1, stock B has a beta of 1.08 and stock C has a beta of 1.75. What is the portfolio beta? ii. An investor purchases stocks with a rate of return of 35%. If the annual inflation rate in the economy is 15%, determine the real rate of return on the stock.