Please help me understand formulas to be used in excel with answers rounded to 2 decimal places. Thank you!!

b. What is the present value of a security that will pay $30,000 in 15 years if securities of equal risk pay 5.25% annually?

c. You have $89,000 in a brokerage account, and you plan to deposit an additional $22,000 at the end of each future year until your account reaches $750,000. You expect to earn 13% annually on the account. How long will it take to reach your goal?

d. You just received an inheritance worth $150,000. You want to retire in 25 years and you plan to contribute an additional $15,000 at the end of each year. If you need $1,500,000 in order to retire, what interest rate must you earn in order to reach your goal?