The cost of three notebooks = ₹37.30 x 3 = 37.30 + 37. 30 + 37.30 = 111.90
Thus, total cost of 3 notebooks = ₹111.90
Similarly, the cost of 10 pens = ₹13.50 x 10 = 135.0, i.e. ₹135
The total cost of all items = ₹111.90 + ₹135 = ₹246.90
Hence, Alex will have to pay ₹246.90 in total.