If a certain mobile phone is sold at a fixed price. Each can make a profit of 800 yuan. 20% off promotion now. As a result, the sales volume increased by 3 times, and the total profit obtained increased by 50%. So how much is the price of each mobile phone after the discount?
某种手机若按定价销售．每部可获利800元．现在打八折促销．结果销售量增加了3倍，获得的总利润增加了50%．那么打折后每部手机的售价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2_500 * (4/5)</gadget>
<output>2_000</output>

<result>2_000</result>