In need of help with the problem, if anyone can assist and help me understand this exact excel sheet that would be amazing. Please help.

NewAge Pharmaceuticals produces the drug NasaMist from four chemicals. Today, the company must pro$-$ duce $5000$ pounds of the drug. The three active ingredients in NasaMist are A$,$ B$,$ and C$.$ By weight, at least $7\%$ of NasaMist must consist of A$,$ at least $5\%$ must consist of B$,$ and at least $3\%$ must consist of C$.$ The cost per pound of each chemical and the amount of each active ingredient in one pound of each chemical are given in the file P$04\_48.$xlsx$.$ At least $600$ pounds of chemical $3$ must be used.a$.$ Determine the cheapest way of producing todays batch of NasaMist.