In order to effectively control the rapidly rising housing prices, the State Council issued a new policy on housing loans in April 2010: the down payment ratio was raised from no less than 30% to no less than 50% for a family to purchase a second home. Xiaoming's family is now planning to purchase a house with a total price of 450,000 yuan with a loan (Xiaoming's family already has a house). What is the minimum down payment of 10,000 yuan?
为有效调控过快上涨的房价，国务院于2010年4月出台一项关于住房贷款的新政策：家庭购买第二套住房，首付比例从不低于30%上调至不低于50%．小明家现在打算贷款购买一套总价为45万元的住房(小明家已有一套房子)，首付款最少需要多少万元？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">45 * (1/2)</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>