Need help solving these questions with a financial calculator.

1. You are scheduled to receive annual payments of $3,600 for each of the next 12 years. The discount rate is 8 percent. What is the difference in the present value if you receive these payments at the beginning of each year rather than at the end of each year?
2. You are considering an annuity that costs $160,000 today. The annuity pays $17,500 a year at an annual interest rate of 7.5 percent. What is the length of the annuity time period?
3. Your parents have made you two offers. The first offer includes annual gifts of $10,000, $11,000, and $12,000 at the end of each of the next three years, respectively. The other offer is the payment of one lump sum amount today. You are trying to decide which offer to accept given the fact that your discount rate is 8 percent. What is the minimum amount that you will accept today if you are to select the lump sum offer?
4. A preferred stock pays an annual dividend of $4.10. What is one share of this stock worth today if the rate of return is 9.68 percent?
5. Duke's Garage has cash of $68, accounts receivable of $142, accounts payable of $235, and inventory of $318. What is the value of the quick ratio?
6. A firm has total debt of $4,850 and a debt-equity ratio of .57. What is the value of the total assets?

Need help solving these questions with a financial calculator.