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

Question

Quizplus · Accepted Answer

On average, only 10% of energy is transferred from one trophic level to the next. This means that a secondary consumer would receive only 10% of the energy available in its primary food source. Therefore, a secondary consumer in this field would have access to about 1000 calories (10% of 10,000 calories) of net primary productivity.

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