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The producer level in this food chain is grass, so 100 J of energy is available in grass as food. We have now to apply 10 percent law to the above food chain.

1.  According to ten percent law, 10% of the energy of grass will be available as food in mice. Thus, the energy available to mice will be 10% of 100J, which is 10 J.
2. The energy available to snakes will be 10% of 10J which is 1 J.
3.  And finally, the energy available to peacocks will be 10% of 1 J, which is 0.1 J.

The above conclusions can now be depicted as follows.