A mobile phone franchise store buys a batch of mobile phones of a certain brand. Each mobile phone is priced at 50% of the increased purchase price. Then sell it at a 20% discount, resulting in a profit of 320 yuan for each mobile phone. How much is the purchase price of each mobile phone? (solution by equation)
一家手机专营店购进一批某品牌手机．每部手机按增加进价的50%进行定价．然后八折出售，结果每部手机获利320元．每部手机的进价是多少元？(用方程解)
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (4/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) - 1</gadget>
<output>-3/5 = around -0.6</output>

<gadget id="calculator">(4/5) + (-3/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">320 / (1/5)</gadget>
<output>1_600</output>

<result>1_600</result>