Max kept 100 grams of radioactive iodine in a container. He observed the amount of iodine left in the container after regular intervals of time and recorded them in the table shown below

The half life of radioactive iodine is 8 days, so the amount will halve every 8 days. For a sample of 100 grams:

8 days - 50 g

16 days - 25 g

24 days - 12.5 g

32 days - 6.25 g

40 days - 3.125 g