A shopping mall buys a batch of electrical appliances. The purchase price of each appliance is 230 yuan, and the selling price is 250 yuan. After all the appliances are sold out, the profit is 680 yuan. How many appliances are there in this batch?
某商场购进一批电器，每台电器进价230元，售价250元，这批电器全部售完后赢利680元，这批电器有多少台？
<gadget id="calculator">250 - 230</gadget>
<output>20</output>

<gadget id="calculator">680 / 20</gadget>
<output>34</output>

<result>34</result>