At the secondary consumers stage we have 275 kJ of energy available.
We know from the second law of thermodynamics that energy could be converted from one form to another. However, the energy conversion is not 100% efficient.
Only 10% of the energy that is taken in at a given level is translated to the next level. We are told that the produces have about 27,500 kJ of energy. At the primary consumer stage, the available energy is 2750 kJ. At the secondary consumers stage we have 275 kJ of energy available.
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