The shopping mall buys a product at a cost of 200 yuan/piece and sets the price with a profit margin of 50%. However, because the price is high and no one buys it, it has to be promoted at a 15% discount. Then the profit of the product after the promotion is how much.
商场以200元/件的成本购进一种商品，并以50%的利润率来定价，但因为价高，无人购买，只好打八五折促销，那么促销后该商品的利润是每件多少元．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">200 * (3/2) * (17/20)</gadget>
<output>255</output>

<gadget id="calculator">255 - 200</gadget>
<output>55</output>

<result>55</result>