pair of disposable chopsticks is 0.03 yuan, how much should you pay for buying 15 pairs of such chopsticks?
一双一次性筷子0.03元，买15双这样的筷子应付多少元．
<gadget id="calculator">0.03 * 15</gadget>
<output>0.45</output>

<result>0.45</result>