Happiness Home Appliances Store increased the purchase price of an air conditioner by 40%, and then advertised "10% discount, 20 yuan taxi fare", but the profit was still 448 yuan per unit. How much does this air conditioner cost per unit? (can be solved by equation)
幸福家电商场将一种空调按进价提高40%，然后打出"九折酬宾，外送20元出租车费"的广告，结果每台仍获利448元．这种空调每台进价多少元？(可以用方程解)
<gadget id="calculator">20 + 448</gadget>
<output>468</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">0.9 * (2/5)</gadget>
<output>0.36</output>

<gadget id="calculator">0.36 - 1</gadget>
<output>-0.64</output>

<gadget id="calculator">0.9 + (-0.64)</gadget>
<output>0.26</output>

<gadget id="calculator">468 / 0.26</gadget>
<output>1_800</output>

<result>1_800</result>