A tennis ball is 12 yuan, and the price of a pair of rackets is 19 times that of tennis balls. How much is the total cost of a racket and a tennis ball?
一个网球12元，一副球拍价格是网球的19倍．一副球拍和一个网球一共需要多少元钱？
<gadget id="calculator">12 * 19</gadget>
<output>228</output>

<gadget id="calculator">228 + 12</gadget>
<output>240</output>

<result>240</result>