20. $1,000 is deposited each month in an account paying 4.23% for 15 years. Then, $350 is deposited in a different account with the same yield for 45 years. How much will be in the account of each account? What is the interest accrued over both accounts?

please please answer next one also 21. How large, can a 30-year mortgage can be afforded if the interest rate is 5.12% with monthly payments of $1,500? Calculate the mortgages differences if the interest rate increases to the following:

(a) 6.25%

(b) 7.25%

(c) 8.25%