Someone plz help ASAP

Clam get 5000 Kcal by eating the plankton

Explanation:

Explanation:

In any food chain the amount of energy that is transferred to the successive trophic level is  ten percent of the energy available at the previous trophic level.

Here, manta ray gets 50 kcal of energy by eating the  starfish

The amount of energy contained in star fish is equal to

\begin{gathered}0.1 * X = 50 \\X = 500\end{gathered}0.1∗X=50X=500 Kcal

Now Starfish gets its energy from clam.

Therefore total energy in clam is equal to

\begin{gathered}0.1 * X = 500\\X = 5000\end{gathered}0.1∗X=500X=5000

Therefore, clam get 5000 Kcal by 

what are the choices?