A monthly payment of $$500$ is deposited in a retirement savings account at $3\%$ for $20$ years. The deposit is made at the end of every month. Interest is compounded monthly.At the end of $20$ years, the depositor found the balance of the account was inadequate for his retirement and he decided to continue the same deposit plan for another $5$ years.How much more, in the nearest dollar, will he have in the account at the end of the $25$ years compared to the end of $20$ years?