Use 3 kilograms of toffee at 7.8 yuan per kilogram, 5 kilograms of fruit candy at 5.1 yuan per kilogram, and 4 kilograms of crispy candies at 6 yuan per kilogram to make assorted candies. How much yuan per kilogram should be the appropriate price for this assorted candies?
用每千克7.8元的奶糖3千克，每千克5.1元的水果糖5千克，每千克6元的酥心糖4千克，混合成什锦糖，这种什锦糖每千克应定价多少元才合适？
<gadget id="calculator">79.2 / 12</gadget>
<output>6.6</output>

<result>6.6</result>