correct answer is: a) ₹ 97.50

Explanation

1 exercise book price is ₹\;6.50
\therefore 15 exercise books price are =₹\left(6.50\times15\right)
\rightarrow₹\ 97.50
Ans: The price of 15 such exercise books are ₹ 97.50.

Other ways to ask this same question are:
1. Calculate the total cost of purchasing 15 exercise books if the price of one exercise book is ₹6.50.
2. Find out the total price of buying 15 exercise books when each exercise book costs ₹6.50.
3. What is the total amount needed to buy 15 exercise books priced at ₹6.50 each?
4. Determine the cost of purchasing 15 exercise books at ₹6.50 each.
5. Calculate the total expenditure for purchasing 15 exercise books at a price of ₹6.50 per book.