In order to calculate the amount spend in each item, let's calculate the corresponding fraction of the total value.
For rent, we have:
[tex]\frac{3}{20}\cdot3060=\frac{3}{2}\cdot306=3\cdot153=459[/tex]And for food, we have:
[tex]\frac{1}{2}\cdot3060=1530[/tex]So adding these costs, we have:
[tex]459+1530=1989[/tex]So we plan to spend $1989 on these two items.