How can I solve this problem in SET ANALYSIS?

[#1]

I attach a qvw with data to solve the problem in set analysis

This is the solution:

MARCA	MARCA_EQ	MES	VALOR	EXPRESION
FORD	F100	200911	10	20
F100		200911	20
FORD	F100	200912	15	25
F100		200912	25

I hope you can help

Thanks a lot.