prefer handwritten calculations than excel( u can use excel if it's complicated) Thanks!

3. (8pts) Same as the question above, if you want to have $400,000 available to purchase an apartment 8 years from now, but this time the amount of annual deposits you can make is $28,000. What must be the minimum interest rate? 4. (12pts) I deposit $5,000 into an account today. One year from now, I deposit another $6,000. Each successive year I deposit $1,000 more than the previous year. If I do this for 15 years (Note that there are 16 payments including the initial payment) and the interest rate is 1%, what is the amount in the account at the end of 15 years