A certain computer city plans to promote A-type computers during the "May 1st" period. A 10% discount will earn 320 yuan, and a 25% discount will result in a loss of 250 yuan. What is the cost price of the computer?
某电脑城计划"五•一"期间对A型电脑促销，减10%赚320元，打7.5折，亏250元，电脑成本价是多少元．
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3_800 * (3/4)</gadget>
<output>2_850</output>

<gadget id="calculator">2_850 + 250</gadget>
<output>3_100</output>

<result>3_100</result>