The Suning Appliance Store purchased a batch of refrigerators at a price of 1,500 yuan each, priced at 40% of the profit. When there are only 10 refrigerators left, in addition to recovering the full cost of purchasing these refrigerators, the profit has been 9,000 yuan. How many refrigerators are there in total?
苏宁电器商场购进一批电冰箱，每台进价1500元，以盈利40%定价．当卖到还剩10台时，除收回购进这批电冰箱的全部成本外，已盈利9000元．这批电冰箱共有多少台？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">(7/5) * 1_500 * 10</gadget>
<output>21_000</output>

<gadget id="calculator">21_000 + 9_000</gadget>
<output>30_000</output>

<gadget id="calculator">(7/5) * 1_500</gadget>
<output>2_100</output>

<gadget id="calculator">2_100 - 1_500</gadget>
<output>600</output>

<gadget id="calculator">30_000 / 600</gadget>
<output>50</output>

<result>50</result>