Uncle Wang is a professional vegetable grower. His family has a vegetable field of (3/4) hectares, 40% of which are soybeans. How many hectares does Uncle Wang grow soybeans?
王大爷是蔬菜种植专业户，他家的一块菜地有(3/4)公顷，其中40%种大豆，王大爷家种大豆多少公顷？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/4) * (2/5)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>