A supermarket sells a batch of vegetables at a price reduced to 75% of the original price, so that the profit is only 2/5 of the original plan. It is known that the purchase price of this batch of vegetables is 7 yuan and 7 cents per kilogram. The planned profit is 2860 yuan, so how many kilograms of this batch of vegetables are there?
某家超市将一批蔬菜的价格降到原价的75%卖出，这样所得的利润就只有原计划的(2/5)，已知这批蔬菜的进价是每千克7元7角，原计划可获利润2860元，那么这批蔬菜共有多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/5) / (1/4)</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">2_860 * (12/5)</gadget>
<output>6_864</output>

<gadget id="calculator">6_864 - 2_860</gadget>
<output>4_004</output>

<gadget id="calculator">4_004 / 7.7</gadget>
<output>520</output>

<result>520</result>