Salma bought 65 books for ₹ 1050 from one shop and 50 books for ₹ 1020 from another. What is the mean price she paid per book?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → ₹ 18
The mean price per book is the total money spent divided by the total number of books bought.
Total money: ₹1050 + ₹1020 = ₹2070
Total books: 65 + 50 = 115
Mean price \(\displaystyle=\frac{2070}{115}=18\), that is, ₹18 a book
Tip: Do not average the two shop prices (about ₹16.15 and ₹20.40 a book). The two shops sold different numbers of books, so the plain average of the two prices, about ₹18.28, is not the mean price.