150克=0.15千克;
200克=0.2千克;
28×0.15+0.2×4+1,
=4.2+0.8+1,
=6(元);
6×(1+60%),
=6×160%,
=9.6(元);
答:这盘菜应售9.6元.
故答案为:9.6.