Mingming, Lili, and Yangyang are going to buy a copy of "Xinhua Dictionary" with a unit price of 30 yuan. They just saw the New Year's Day promotion. Bookstore A launched a "buy one get one free" campaign, and bookstore B offered a 40% discount For sale activities, which bookstore do you recommend them to go to buy a good deal, and how much does each person spend?
明明、丽丽和阳阳三人准备每人买一本单价为30元的《新华字典》，他们正好看到元旦促销，甲书店推出"买一送一"活动，乙书店推出打六折优惠出售活动，你建议他们去哪个书店里去买划算，每人只花多少钱？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) / 3</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3 * 30 * 2 * (1/10)</gadget>
<output>18</output>

<result>18</result>