A man allows a discount of 10% on a book whose marked price is rupees 40. What is the cost price of the book so that the profit is 20%. ?.
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Answer:
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Step-by-step explanation:
let c.p of article=Rs.y
according to q.s=
y×120/100=40×90/100
=>y=40×90/120
=>y=30
Ans-is 30 Rs
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