a$.$ What is the product ingredient mix? liver flavor biscuits $=,$ chicken flavor biscuits $=$

b$.$ What is the total cost of a package of dog biscuits using the optimal mix? cents

c$.$ Are there any unused resources?

If so$,$ in what constraint, and by how much?

d$.$ What if federal requirements for nutrient A was reduced by $5$ units, what would the overall cost be$?$