Mr. Li bought a house by installment payment. Through negotiation, the purchase price was paid in three installments, each time paying 20% more than the previous one. Knowing that the second payment is 120,000 yuan, how much is the first payment?
李老师用分期付款的方法购买一套住房，通过协商，购房款分三次付清，每次比前一次多付20%．己知第二次付款120000元，问第一次付款多少万元？
<gadget id="calculator">120 / 100</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">120_000 / (6/5)</gadget>
<output>100_000</output>

<gadget id="calculator">100_000 / 10_000</gadget>
<output>10</output>

<result>10</result>