2. You buy a stock at $100 and sell it for $140;what is the percentage return if the margin requirement is 40 % and the interest rate of borrowed funds is 10%.

3. You want to buy a new sports car 3 years from now and you want to save $4,200 per year, beginning one year from today. You will deposit your savings in an account that pays 5% annual compounding interest rate. How much will you have at the end of three years?

4. You sell a stock for $50.00 that was held for 10 years. You earned a return of 8%. What was the original cost of the stock?