A pair of trousers is 28 yuan, and the price of a jacket is twice that of a pair of trousers. How much does it cost to buy a top?
一条裤子28元，一件上衣的价钱是一条裤子的2倍．买一件上衣需要多少钱？
<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<result>56</result>