Xiaojia's mother went to the market to buy fruit. She first bought 2.5kg of oranges for 10.5 yuan, and she also planned to buy 3kg of imported grapes. The price of imported grapes is 1.8 times that of oranges. How much should I pay to buy imported grapes?
小佳的妈妈去市场买水果．她先花10.5元买了2.5㎏橙子，还打算买3㎏进口葡萄，进口葡萄的价格是橙子的1.8倍．买进口葡萄应付多少钱呢？
<gadget id="calculator">10.5 / 2.5</gadget>
<output>4.2</output>

<gadget id="calculator">4.2 * 1.8 * 3</gadget>
<output>22.68</output>

<result>22.68</result>