A farmer is planning his spring planting. He has 20 acres on which he can plant a combination of Corn, Pumpkins and Beans. He wants to maximize his profit but there is a limited demand for each crop. Each crop also requires fertilizer and irrigation water which are in short supply. The following table summarizes the data for the problem. 
What are the key formulas in cells F5 and E8 for this Excel spreadsheet implementation of the following formulation? 
Definitions:
Voltage
An electrical measurement of potential difference, electrical pressure, or electromotive force (EMF).
Cuprous Cyanide
A chemical compound used to electroplate copper to iron.
Plating Copper
A process used to coat a surface with a thin layer of copper, often for improving electrical conductivity or for aesthetic purposes.
Poisonous Solid
A solid substance that is harmful or lethal to living organisms when ingested, inhaled, or absorbed.
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