A volleyball is 12 yuan, and the price of a basketball is 21 times the price of a volleyball. How much is a basketball?
一个排球12元，一个篮球的价钱是一个排球价钱的21倍，一个篮球多少元？
<gadget id="calculator">12 * 21</gadget>
<output>252</output>

<result>252</result>