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Lỗi biên dịch:

Main.java:1: error: class TinhTienMuaDoHoc is public, should be declared in a file named TinhTienMuaDoHoc.java
public class TinhTienMuaDoHoc {
       ^
Main.java:7: error: cannot find symbol
        double tongTien = (soluongBut * giaBut) + (soluongVo * giaVo); 
                                                   ^
  symbol:   variable soluongVo
  location: class TinhTienMuaDoHoc
2 errors