If there are 10,000 calories of net primary productivity in a field,how much on average will be available to a secondary consumer?

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In an ecological energy pyramid, only about 10% of the energy from one trophic level is passed on to the next level. Therefore, if there are 10,000 calories at the level of primary producers, primary consumers (herbivores) would on average receive about 1,000 calories (10% of 10,000). Secondary consumers, in turn, would receive about 10% of that, which is 100 calories.

If There Are 10,000 Calories of Net Primary Productivity in a Field,how