A person buys a house in installments, paying 25,000 yuan when buying, and 1,500 yuan a month thereafter; or paying 3,000 yuan for the first half of the time, and 1,000 yuan for the second half of the time. The total amount and time of the two payments are the same, how much is the house price?
某人分期付款买房，买时付款2.5万元，以后每月付款1500元；或前一半时间付款3000元，后一半时间付款1000元．两种付款总数及时间都相同，房价是多少元？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3_000 * (1/2)</gadget>
<output>1_500</output>

<gadget id="calculator">1_000 * (1/2)</gadget>
<output>500</output>

<gadget id="calculator">500 - 1_500</gadget>
<output>-1_000</output>

<gadget id="calculator">1_500 + (-1_000)</gadget>
<output>500</output>

<gadget id="calculator">25_000 / 500</gadget>
<output>50</output>

<gadget id="calculator">50 * 1_500</gadget>
<output>75_000</output>

<gadget id="calculator">75_000 + 25_000</gadget>
<output>100_000</output>

<result>100_000</result>