A disk drive manufacturer estimates that in five years a storage device with 1 terabyte of capacity will sell with probability 0.5, a storage device with 500 gigabytes capacity will sell with a probability 0.3, and a storage device with 100 gigabytes capacity will sell with probability 0.2. The revenue associated with the sales in that year are estimated to be $50 million, $25 million, and $10 million, respectively. Let X be the revenue of storage devices during that year. Determine the probability mass function of X.
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