A shopkeeper buys some notebooks at the rate of 12 for ₹222, and an equal number of notebooks at 10 for ₹225. If he sells all the notebooks at a profit of 20%, then the selling price of 15 notebooks is:

₹369

Profit % = 20%

5 × 12 = 60 = 222 × 5 = Rs.1110

6 × 10 = 60 = 225 × 6 = Rs.1350

Total number of Notebook = 120

Total cost price of all Notebook = 1110 + 1350 = Rs.2460

Let the SP = x

20 = \(\frac{x - 2460}{2460}\) × 100

SP = x = 2952

Selling price of 1 Notebook = \(\frac{2952}{120}\)  = Rs.24.6

Selling price of 15 Notebook =  24.6 × 15 = Rs.369