A man bought 4 books for ₹50 each, 5 books for ₹60 each and 6 books for ₹70 each. The average cost of a book for the man is (round up to two decimal places):
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 61.33.
Total cost of 4 books = 4 × 50 = ₹200
Total cost of 5 books = 5 × 60 = ₹300
Total cost of 6 books = 6 × 70 = ₹420
Total cost = 200 + 300 + 420 = ₹920
Total number of books: 4 + 5 + 6 = 15
Average = Total cost/Total books = 920/15 = ₹61.333... = 61.33 (approx)
Therefore, the average cost of a book for a man is ₹61.33.