Tractor World offers warranties on all their tractors. They estimate warranty expense at $2\mathrm{.}4\%$ of sales. At the beginning of $2017,$ the estimated warranty payable account had a credit balance of $$900.$ During the year, Tractor World had $$285,000$ of sales, and had to pay out $$5,100$ in warranty payments.

Refer to Table $11-14.$ At the end of the year, how much warranty expense was reported on the income statement?

$$5,100$

$$6,840$

$$2,640$

$$4,200$