if the total amount of energy in the producer level of an ecosystem is 40,000 kilocalories, approxmatley how much energyis avaliable for the primary consumer

4,000 kilo-calories.

Explanation:

The ten percent rule states that 90 percent of the overall energy loose due to the energy and heat at every level in an ecosystem and only 10 percent passed on to the next tropic level.

By this rule,

The total amount of energy present in producer level : 40,000 kilo-calories. Then the next tropic level is primary consumer and only 10 percent of this energy will be passed on to this tropic level. So,

[10% of 40,000] kilo-calories] = The amount of energy will pass to primary consumer

The amount of energy will pass to primary consumer= 4,000 kilo-calories.