example:%20Energy%20at%20primary%20consumer%20level%20/%20Producer%20energy%20=%20________%20X%20100%25%20=%20________%20%25%20available%20to%20primary%20consumer%0A490%20/%205000%20kcal%20=%200.098%20x%20100%20=%209.8%25%20available%20to%20primary%20consumer!%20100%20%E2%80%93%20_______%20(%25%20available)%20=%20______%20%25%20energy%20lost%0A100%20%E2%80%93%209.8%25%20=%2090.2%25%20lost!

100 - 9.8% = 90.2% energy lost