How much orange juice at 42¢ a liter should be mixed with grapefruit juice worth 32¢ a liter to make 200 liters of a mixture worth 36¢ a liter? If x represents the amount of orange juice used, then which of the following expressions represents the total cost of the grapefruit juice used? 0.32x 0.32(200 - x) 0.32(x + 200)

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