The original price of a set of furniture is 15,000 yuan, and now it is sold at a 20% discount. If you use a VIP card, you can get another 5% discount. If your mother holds this VIP card, how much does it cost to buy this set of furniture?
一套家具原价15000元，现在八折优惠出售，如果使用VIP贵宾卡可以再优惠5%，妈妈持有这种VIP卡，买这套家具需要多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">15_000 * (4/5) * (19/20)</gadget>
<output>11_400</output>

<result>11_400</result>