Grandpa Wang bought back 800 kilograms of apples at a price of 0.8 yuan per kilogram. After selection, he divided this batch of apples into grades A and B. The mass ratio of grades A and B was 3:5, and grade B apples could only be sold at a price of 0.7. If Grandpa Wang wants to get a 25% profit, how much should the first-class apples be sold for per kilogram?
王爷爷以每千克0.8元的价格购回800千克苹果，经过挑选，把这批苹果分成了甲、乙两等，甲、乙两等的质量比是3：5，乙等苹果只能以0.7元的价格出售，王爷爷要想获得25%的利润，甲等苹果每千克应卖多少元？
<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 * 800 * (5/4)</gadget>
<output>800</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">800 * (5/8)</gadget>
<output>500</output>

<gadget id="calculator">0.7 * 500</gadget>
<output>350</output>

<gadget id="calculator">800 - 350</gadget>
<output>450</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">800 * (3/8)</gadget>
<output>300</output>

<gadget id="calculator">450 / 300</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>