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I'm working on this problem out of my book and I'm come to a problem that I'm very confused on. I'm not really sure where to even start with it. The problem is:

Problem: Radium 88Ra224 has a half-life of about 3.6 days. Given 1 gram, how much will still be present after 1 day? After 1 year?

Please explain each step and equations used.

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