3 friends went to a bookshop to buy some exercise books. The prices for each type of exercise books were Rs. 45, Rs. 50, Rs. 65, Rs. 70 and Rs. 100. However the owner of the bookshop prefers more customers than having a few customers buying several exercise books. So, a customer buying his 'x'th exercise book has to pay x times the original price. The three friends who have not bought any exercise book from the bookstore before, decide to buy a total of 5 books, one from each type. What is the maximum cost at which they could buy all the 5 exercise books?

Question

anonymous · Answer

I am very sorry it is minimum cost

anonymous · Answer

No the question says that they bought one book each of all types(categories) of books

anonymous · Answer

They have given some answers
(A) 270      
(B) 305
(C) 330
(D) 365
(E) 425

Also because there are three friends, one can buy only one book and the other two can buy 2 books

faiqraees · Answer

Minimum cost = Minimum price paid by all friends
Minimum cost = Number of books x lowest price
Minimum cost = 2x45 +2x50 +1x65+1x70+1 x 100
Minimum cost = ???