Find the amount of the payment to be made into a sinking fund so that enough will be present to accumulate the following amount. Payments are made at the end of each period. $55,000; money earns 6% compounded semiannually for 321 years How much money must she deposit at the end of each quarter? 4 (Do not round until the final answer. Then round to the nearest cent as needed.) An investor needs $12,000 in 19 years. (a) What amount should be deposited in a fund at the end of each quarter at 9% compounded quarterly so that there will be enough money in the fund? (b) Find the investor's quarterly deposit if the money is deposited at 4.1% compounded quarterly. Find the final amount in the following retirement account, in which the rate of return on the account and the regular contribution change over time. $1400 per quarter invested at 6.6%, compounded quarterly, for 13 years; then $1800 per quarter invested at 6.7%, compounded quarterly, for 15 years. Find the final amount in the account. $ (Do not round until the final answer. Then round to the nearest dollar as needed.)