15 copies of a book were sold for Rs.5400/- thereby gaining cost price of 3 copies. The cost price of a copy is:
Answer & explanation
Correct answer: option 2
Profit = S.P. of 15 - C.P. of 15
C.P. of 3 = S.P. of 15- C.P. of 15
C.P. of 18 = S.P. of 15
C.P. : S.P.
15 : 18
⇓ ⇓ × 300
⇓ × 300 5400 (given)
(15× 300)
C.P of 15 articles = 15× 300
C.P. of each article = Rs.300/-