The current interest rate is $2\%.$ A bank has $$62$ of assets. These assets have an average duration of $13\mathrm{.}8.$ How many assets will the bank have if the Fed raises interest rates by $5\mathrm{.}8\%?$

Note: your answer should have at least two decimal places.

$($the correct answer is $13\mathrm{.}3482)$ please show me how you get that