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Grape = 250 (250 + 250 + 250 + 250 = 1000)

Watermelon = 0 (0 + 250 + 250 = 500)

Banana = 125 (2 x 125 + 0 + 250 = 500)

Result => 250 + 125 - 250 x 0 = 375

The answer is 0

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Zero 0 :-)