Mr. Wang took a fancy to a 90-square-meter commercial house on the fifth floor of "People's Spring". The market price of the house is 4,000 yuan per square meter. The state requires developers to give away part of the commercial housing to low-income people. The unit price of the 60 square meter part of the commercial housing is calculated according to (3/4) the market price of the house, and the excess part is calculated according to the market price. How much is the minimum cost for Mr. Wang to obtain this housing?
王先生看中了"百姓春天"一套五楼90平方米的商品房，房子的市场价是每平方米4000元．国家要求开发商将该商品房的一部分让利于低收入者，该商品房面积中的60平方米部分，单价按房子市场价的(3/4)计算，超过部分按市场价计算．王先生获得此住房最少要多少钱？
<gadget id="calculator">90 - 60</gadget>
<output>30</output>

<gadget id="calculator">30 * 4_000</gadget>
<output>120_000</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4_000 * (3/4) * 60</gadget>
<output>180_000</output>

<gadget id="calculator">120_000 + 180_000</gadget>
<output>300_000</output>

<result>300_000</result>