To prepare assorted candies, the purchase price is milk candy: 3.6 yuan/kg, fruit candy: 2.8 yuan/kg, and crisp candy: 2.1 yuan/kg. Mix these candies into assorted candies in a ratio of 2:3:1, and then press 20% profit pricing, what is the pricing per kilogram of assorted sugar?
配制什锦糖，进价分别是奶糖：3.6元/千克，水果糖：2.8元/千克，酥糖：2.1元/千克，把这些糖按2：3：1的比例配制成什锦糖，然后按20%的利润定价，每千克什锦糖的定价是多少？
<gadget id="calculator">3.6 * 2</gadget>
<output>7.2</output>

<gadget id="calculator">2.8 * 3</gadget>
<output>8.4</output>

<gadget id="calculator">7.2 + 8.4 + 2.1</gadget>
<output>17.7</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2 + 3 + 1</gadget>
<output>6</output>

<gadget id="calculator">(6/5) / 6</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">17.7 * (1/5)</gadget>
<output>3.54</output>

<result>3.54</result>