A fossil contains a radioactive element with a half-life of 4.5 million years. If the ration of the radioactive element to decay product is 1:8 (12.5% to 87.5%), how old is the fossil?

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.

The answer is e &