ATQ, Monthly income of 'D' = 150% of 30,000 = (1.5) X 30,000 = Rs. 45,000 Savings of 'C' = (100 - 30) % of 30,000 = (0.7) X 30,000 = Rs. 21,000 Savings of 'D' = (100 - 50) % of 45,000 = (0.5) X 45,000 = Rs. 22,500 So, required difference = 22,500 - 21,000 = Rs.1,500
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