An easy wayt calculate the amount of energy availabe at each level of the energy pyramid

By applying 10% rule amount of energy available at each level of the energy pyramid can be calculated.

Explanation:

We know that only 10% of the energy is transferred from one trophic level to another.

The amount of energy reaching the other trophic level can be obtained by 10 % rule.

The energy obtained by higher level can be deducted from the previous level to know the amount of energy present in the trophic level.

Since producers contain most energy subsequent trophic level energies can be calculated.

After knowing the amount of energy transferred the and deducting it from total status could be known.