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The optimal solution selects projects 1, 3, and 4, while excluding project 2. This corresponds to the binary variable values $X_1=1, X_2=0, X_3=1, X_4=1$.

Conditions: The model includes four projects with specific returns and monthly costs.; The objective is to maximize total net return subject to monthly budget constraints.; Variables are binary ($X_i \in \{0, 1\}$).

The optimal solution selects projects 1, 3, and 4, while excluding project 2. This corresponds to the binary variable values $X_1=1, X_2=0, X_3=1, X_4=1$.

Conditions: The model includes four projects with specific returns and monthly costs.; The objective is to maximize total net return subject to monthly budget constraints.; Variables are binary ($X_i \in \{0, 1\}$).