Ashok purchased 100 books of quantitative aptitude for his book store. He sold 20% of total books at a profit of 10%, 37.5% of remaining at a profit of 15%, 80% of the remaining at a profit of 8% and remaining at a profit of 20%. If he sold all the books at a profit of 16% he would have gained Rs. 1505 more, then find the cost price of each book.
A) Rs. 250 B) Rs. 375 C) Rs. 350 D) Rs. 450