i know 14 but need answer for 15

QUESTION 14 Ishan and Hazel plan to retire at age 60 with a retirement income of $48,000 a year from their savings. Rather than pay themselves the whole amount at the beginning of each year, they have decided that payment at the beginning of each quarter of $12,000 gives them the right balance of flexibility and maximized interest earnings. They feel they can safely earn an interest rate of 7.5%, compounded quarterly, on their money and they are budgeting based on the prediction that they will live until they are 90 years old. How much money will they have to have saved by the time they are 60 in order to reach their retirement goal? 581832.99 If they do live the full 30 years, and spend their full quarterly budget, how much money in total will they have lived on/spent in their retirement? 1440000.00 For Blank 3 How much will have been earned in interest? 858167.01 If they saved the same total amount of their own money, but no interest earned over the years whatsoever, how much would be available to live on each quarter? 4848.61 QUESTION 15 Now that Ishan and Hazel have their saving goal calculated, and rounded up to the nearest dollar, they want to start budgeting to reach that goal. They are 40 years old currently, so they have just 20 years to save up the total they calculated they would require so that they can still reach their goal of retirement by age 60. If they assume the same interest rate, and make deposits into their savings at the beginning of every month, how much would their deposit have to be each month? How much interest will be earned