First let's calculate how much money Delia saves if she cooks home:
[tex]45-12=33[/tex]So she saves $33 each time she cooks home instead of going to the restaurant.
If she goes to this restaurant 2 times a week, and we want the savings for 4 weeks, she would go a total of 8 times to the restaurant, so we just need to multiply the saving by 8:
[tex]33\cdot8=264[/tex]So she would save $264.