The selling price of a book, including the sales tax, is ₹ 956.34. The rate of sales tax is 10%. If the shopkeeper has made a profit of 15%, then the cost price of the book is:

₹756

The selling price of a book, including the sales tax = ₹ 956.34

Tax = 10% and 

Profit made by shopkeeper = 15%

Then the cost price of the book = 956.34 × \(\frac{100}{110}\) × \(\frac{100}{115}\) = 756