A supermarket sells a product at a price of 40% more than the purchase price, but the sales are not good, and only 1/4 of it is sold. Later, the boss cuts the price by 40% and sells it at 210 yuan, and it is sold out soon. Then the profit and loss of this business is the average loss per piece
某超市按进价加40%作为定价销售某种商品，可是销售得不好，只卖出了(1/4)，后来老板按定价减价40%以210元出售，很快就卖完了，则这次生意盈亏情况是平均每件亏了多少元
<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">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">250 * (7/5) * (1/4)</gadget>
<output>175/2 = around 87.5</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">210 * (3/4)</gadget>
<output>315/2 = around 157.5</output>

<gadget id="calculator">(175/2) + (315/2)</gadget>
<output>245</output>

<gadget id="calculator">250 - 245</gadget>
<output>5</output>

<result>5</result>