Answer:
$2313.51
Explanation:
Here we calculate the future value for each cash flow and add them up.
Given he deposited $700 at the end of the first year .
Here time to maturity is 3years and interest rate is 6%.
=

Given he deposited $500 at the end of the second year .
Here time to maturity is 2 years and interest rate is 6%.
=
.
Given he deposited $300 at the end of the third year .
Here time to maturity is 1years and interest rate is 6%.
=
.
Also given that he deposited $600 at the end of fourth year .There will be no interest on this amount as it is done at the end.
Terminal value=833.71+561.8+318+600=$2313.51