Given the following chart,calculate the cost function.Interpret the function to calculate variable costs and fixed costs: 
Definitions:
Phosphate Group
A chemical group consisting of a phosphorus atom bonded to four oxygen atoms, crucial for energy transfer in biological organisms.
Magnesium
A lightweight, silvery-white alkaline earth metal, crucial for various biological processes.
Enzymatic Activity
Refers to the catalytic action performed by enzymes, speeding up biochemical reactions within organisms without being consumed in the process.
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