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Daily sales at a store is a random variable, with values of $100, 300, 500, and 800 with probabilities 0.2, 0.2, 0.5, and 0.1 respectively.

Daily sales at a store is a random variable, with values of $100, 300, 500, and 800 with probabilities 0.2, 0.2, 0.5, and 0.1 respectively. What is the expected value of sales?

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