Using either logarithms or a graphing calculator, find the time required for the initial amount to be at least equal to the final amount. $4000, deposited at 5% compounded quarterly, to reach at least $7000 The time required is year(s). (Type an integer or decimal rounded up to the next quarter.) Erin took out a 15-year mortgage with an annial knterest rate of 6% to purchase a house for 5200,000 with a down payment of $20,000. Find the anount of the monthly payment needed to amontize this loan. The amount of the monthly payment needed to amortize this loan is 1 (Round to the nearest cent as needed)