shopping mall goes to the apple producing area to buy apples. The producing area is 400 kilometers away from the shopping mall, and the shipping fee is 1.50 yuan per ton for 1 kilometer. If the loss in the transportation and sales process is 10%, the market will set the price at 2.5 yuan/kg based on a 25% profit. How much is the purchase price of apples per kilogram?
某商场到苹果产地去收购苹果，产地距商场400千米，运费为每吨运1千米收1.50元．如果在运输及销售过程中的损耗是10%，商场按25%的利润定价为2.5元/千克．苹果的收购价是每千克多少元？
<gadget id="calculator">900 * 2.5</gadget>
<output>2_250</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">2_250 / (5/4)</gadget>
<output>1_800</output>

<gadget id="calculator">400 * 1.5</gadget>
<output>600</output>

<gadget id="calculator">1_800 - 600</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 / 1_000</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>