某超市用3000元购进某种干果，由于销售状况良好，超市又用9000元第二次购进该干果，但第二次的进价比第一次的提高了20%，第二次购进干果数量是第一次的2倍还多300千克．

（1）求该干果的第一次进价是每千克多少元？

（2）百姓超市按每千克9元的价格出售，当大部分干果售出后，余下的按售价的8折售完，若两次销售这种干果的利润不少于5820元，则最多余下多少千克干果按售价的8折销售．

      On weekdays, David gets up at 6:30.He has breakfast at seven and then he goes to school by bus. He gets there at 7:15. He doesn't like to be late. Classes begin at 8:00. He has lunch at twelve at school. He goes home at 5:30 in the afternoon. On weekends, he gets up at about 8:00 and makes breakfast for his family. His parents like him very much.