The store decides to sell a certain commodity at 80% of the original price, so that the profit is only 40% of the original plan. It is known that the purchase price of this commodity is 4 yuan each, and the original plan can make a profit of 600 yuan. Then this How many items are there in total?
商店决定将某种商品按原价的80%卖出，这样所得的利润就只有原计划的40%，已知这种商品的进价是每个4元，原计划可获利润600元，那么这种商品共有多少个？
<gadget id="calculator">600 * 0.8</gadget>
<output>480</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">600 * (2/5)</gadget>
<output>240</output>

<gadget id="calculator">480 - 240</gadget>
<output>240</output>

<gadget id="calculator">480 / 240</gadget>
<output>2</output>

<gadget id="calculator">600 / 2</gadget>
<output>300</output>

<result>300</result>