Has anyone tried to weigh the food and the snake to determine what percentage of the food actually becomes snake and what % ends up just excrement?

In other words if I feed a snake 200g of food, how much weight will the snake gain or what percent of the food by weight will become part of the snake.

Can anyone guess? Is it 10%, 25%, or 50%?

I am referring to growth rates of younger individuals, say from hatchlings to sub-adults.

Larry