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ATQ,
(x × 0.14 × 2) + {(x + 600) × 0.11 × 2} = 1512
Or, 0.28x + 0.22x + 132 = 1512
Or, 0.50x = 1380
Or, x = 1380 / 0.50 = 2760
Or, x = Rs.2760
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