According to the 10 percent law, only 10% of the energy is transferred to each trophic level from its lower trophic level. If 10,000 joules of energy is available to the producer, then only 1000 joules $\left(10000\mathrm{ }\times 10/100\mathrm{ }=\mathrm{ }1000\right)$ of energy will be available to the primary consumer and only 100 joules $\left(1000\times 10/100=\mathrm{ }100\right)$ of energy will be available to ${\mathrm{T}}_2$ organism.