In this problem the total amound (29580) represent the 100% so we have to calculate the 36% with a rule of three so:
[tex]\begin{gathered} 29580\to100 \\ x\to36 \end{gathered}[/tex]and the equation is:
[tex]\begin{gathered} x=\frac{36\cdot29580}{100} \\ x=10648.8 \end{gathered}[/tex]So the cost of the food is $10,648.8 dollars