To transport the same 78 boxes of goods, if you use a large truck that can hold 5 boxes of goods, the freight will be 130 yuan. If you use a small truck that can hold 2 boxes of goods, the freight will be 60 yuan. Reasonable choice of large and small trucks The number of vehicles can make the total freight the most economical, and how much is the most economical total freight.
运相同的78箱货物，如果用能装5箱货物的大卡车运一次，运费为130元，如果用能装2箱货物的小卡车运一次，运费为60元，合理选择大、小卡车的辆数，可使得总运费最省，最省的总运费为多少．
<result>2_060</result>