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ATQ, Let the total work = L.C.M of 15 and 8 = 120 units Then, efficiency of 'B' alone = 120 ÷ 15 = 8 units/day Combined efficiency of 'A' and 'B' = 120 ÷ 8 = 15 units/day So, efficiency of 'A' alone = 15 - 8 = 7 units/day Work done by 'A' alone in 12 days = 7 × 12 = 84 units So, payment received by 'A' = (84/120) × 7200 = Rs. 5,040
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