Manager Xu of the fruit shop wholesales a batch of fruits from other places at a price of 0.8 yuan per kilogram. After selection, the peeled apples are divided into first and second grades, and the mass ratio of first and second grades is 3:5. Second-class apples can only be sold at 0.7 yuan per kilogram. If Manager Xu wants to obtain a 25% profit, please help him calculate: How much should first-class apples be sold per kilogram?
水果店的徐经理，以每千克0.8元的价格从外地批发回一批水果．经过挑选，把着皮苹果分成一、二两等，一、二两等的质量比是3：5．二等只能以每千克0.7元卖出，徐经理要想获得25%的利润，请你帮他算一算：一等苹果应卖每千克多少元？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">0.8 * 8 * (5/4)</gadget>
<output>8</output>

<gadget id="calculator">0.7 * 5</gadget>
<output>3.5</output>

<gadget id="calculator">8 - 3.5</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 / 3</gadget>
<output>1.5</output>

<result>1.5</result>