Xiaojin's mother goes to the supermarket to buy fruit. She first buys 2.5kg of oranges for 6 yuan, and is planning to buy 4kg of grapefruit. The unit price of grapefruit is 1.5 times that of oranges. How much should I pay for grapefruit?
小金的妈妈去超市买水果，她先花6元买了2.5kg桔子，还准备买4kg柚子，柚子的单价是桔子的1.5倍．买柚子应付多少钱？
<gadget id="calculator">6 / 2.5</gadget>
<output>2.4</output>

<gadget id="calculator">2.4 * 1.5 * 4</gadget>
<output>14.4</output>

<result>14.4</result>