The equation M(t) = c(2)^t/D is often used when calculating the length of time required for something to double its original quantity. M represents the amount at any given time, c is the initial amount, t is the time and D is the doubling period. Thirty years after he wore it, Michael Jordan's college jersey is worth 50 times more today than it was 30 years ago. What is its doubling period? Write two forms of the doubling function.

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