Clearly, marked price of the book = 120% of C.P
Also, cost of paper = 25% of C.P.
Let the cost of paper for a single book be Rs. n.
Then, 120 : 25 = 180 : n ⇒ n = Rs.  = Rs. 37.50

Answer: C) 40 Explanation: The given series follows the rule,+(11x1), +(11x3), +(11x5), +(11x7), +(11x9),.... So starting from 7, 7 + 11 = 18, 18 + 33 = 51, 51 + 55 = 106, ...So wrong number is 40 which is to be 51.

Answer: B) Sun Temple, Konark Explanation: Konark Sun Temple is a 13th century temple of Odisha, built by Narasimhadeva I of the Eastern Ganga Dynasty. It is also known as Black Pagoda. It’s a World Heritage Site. It is considered as architectural marvel for which Odisha, best known worldwide.