I need answer for 3rd and 4th part only.

answer The Case: Hassan Mustafa has recently started his new job as a financial manager in a firm called ScanSoft. ScanSoft is developing a new process to manufacture optical disks. The development costs were higher than expected, so ScanSoft requires an immediate cash inflow of $5,200,000. To raise the required capital, the company decided to issue bonds. Since ScanSoft had no expertise in issuing and selling bonds, Hassan suggested that the company work with an investment dealer. The investment dealer bought the company's entire bond issue at a discount, and then planned to sell the bonds to the public at face value or the current market value. To ensure it would raise the $5,200,000 it required, ScanSoft plans to issue 5200 bonds with a face value of $1000 each, on January 20, 2021. Interest is paid semi-annually on July 20 and January 20, beginning July 20, 2021. The bonds pay interest at 5.5% compounded semi- annually. Hassan Mustafa realized that when the bonds mature on January 20, 2041, there must be $5,200,000 available to repay the bondholders. To have enough money on hand to meet this obligation. He suggested that ScanSoft set up a sinking fund (an interest-bearing account into which payments are made at regular intervals to provide a desired sum of money at a specified future time) using a specially designated savings account. The company earns interest of 1.6% compounded semi-annually on this sinking fund account. ScanSoft began making semi-annual payments to the sinking fund on July 20, 2021. 3. Suppose ScanSoft discovers on January 20, 2031, that it can earn 2.5% interest compounded semi-annually on its sinking fund account. a. What is the balance in the sinking fund after the January 20, 2031, sinking fund payment? b. What is the new sinking fund payment if the fund begins to earn 2.5% on January 21, 20312 What will be the total amount deposited into the sinking fund account the life of the bonds? d. How much of the sinking fund will then be interest? C To travel to his new job, Hassan is shopping for a new vehicle, and has noticed that many vehicle manufacturers are offering special deals to sell off the current year's vehicles before the models arrive. Hassan's local Ford dealership is advertising 3.9% financing for a full 48 months (i.e., 3.9% compounded monthly) or up to $4000 cash back on selected vehicles. The vehicle that Hassan wants to purchase costs $24,600 including taxes, delivery, licence, and dealer preparation. This vehicle qualifies for $1800 cash back if Hassan pays cash for the vehicle. Hassan has a good credit rating and knows that he could arrange a vehicle loan at his bank for the full price of any vehicle he chooses, His other option is to take the dealer financing offered at 3.9% for 48 months. Hassan wants to know which option requires the lower monthly payment. 4. Suppose Hassan buys the vehicle on July 1. What monthly payment must Hassan make if he chooses the dealer's 3.9% financing option and pays off the loan over 48 months? (Assume he makes each monthly payment at the end of the month and his first payment is due on July 31.)