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Price of T.V. set after discount = 80% of Rs. 6000
Marked price of article = 80 + 40 = Rs. 120If the discount be x%, thenx% of 120 = Rs. 40
C.P. of article = Rs. x.
Profit on outlay = Rs. 6000According to the question,25% of outlay = Rs. 6000
Let the marked price of building be Rs. z.∴ According to the question,z × (100 – x)% = y