The price of selling 11 of a commodity at a profit of 5 yuan each is the same as the price of selling 10 at a profit of 11 yuan each. How much is the cost of this product.
某商品按每个5元利润卖出11个的价钱，与按每个11元的利润卖出10个价钱一样多．这个商品的成本是多少元．
<gadget id="calculator">11 * 10</gadget>
<output>110</output>

<gadget id="calculator">5 * 11</gadget>
<output>55</output>

<gadget id="calculator">110 - 55</gadget>
<output>55</output>

<gadget id="calculator">11 - 10</gadget>
<output>1</output>

<gadget id="calculator">55 / 1</gadget>
<output>55</output>

<result>55</result>