Question
A person buys books at Rs. 300 for 5 and sells them at
Rs.740. How many books must he sell in order to earn profit of Rs. 3,520?Solution
C.P. of 5 books = Rs.300 S.P. of 5 books = Rs. 740 ∴ Profit earned by selling 5 books = Rs. 440 Rs. 440 is earned by selling 5 books. ∴ Rs.3, 520 will be earned by selling 
 = 40 books.
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