Ok, good ideas.
Nen phan he so cho tung the loai. Vi vay: don ca * he so 1; song ca, tam ca*he so 2; dong ca, top ca*he so 3; mua hoac kich *4.
Giai toan doan = Tong so diem cua tung tiet muc, cua 5 giam khao (da nhan he so). Nhu vay se cong bang hon.
Chuc cuoc thi thanh cong.
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Phuc, Nguyen Quang
PhD Candidate in Utrecht Univeristy, Netherlands
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