At a certain pizza parlor, 59% of the customers order a pizza containing onions, 50% of the customers order a pizza containing sausage, and 60% order a pizza containing onions or sausage (or both). Find the probability that a customer chosen at random will order a pizza containing both onions and sausage.
Write your answer as a decimal (not as a percentage). (If necessary, consult a list of formulas.)
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