If you withdraw part of your money from a certificate of deposit before the date of maturity, you must pay an interest penalty. Suppose you invested $$4,000$ in a one$-$year certificate of deposit paying $8\mathrm{.}4\%$ interest. After $6$ months, you decide to withdraw $$3,000.$ Your interest penalty is $3$ months simple interest on the $$3,000.$ What interest penalty $($in dollars$)$ do you pay? $($Round your answer to two decimal places.$)$

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