Help!!!!!!!!!!!

 

3. Suppose you wish to have $20,000 in your account at the end of six years.  The account pays annual interest of 3% compounded quarterly.  How much money will you need to invest in the account now?

 

and 

 

 

4. 

1. An amount of $16,000 is invested at an interest rate of 3% per annum, compounded annually.  Find the amount of compound interest earned after two years.

 

 

and    

 

 

1. An amount of $30,000 is invested at an interest rate of 5% per annum, compounded annually.  Find the amount of compound interest earned after four years.