The correct answer is A. Rs 6562.50.
The cost of the materials transferred in is 13,500 units x Rs 4.50 per unit = Rs 60750.
The cost of the additional materials added in process is 13,500 units x Rs 1.25 per unit = Rs 16875.
The cost of the labour and overheads is 11,750 units x Rs 6.25 per unit + 1750 units x Rs 2.50 per unit = Rs 83125.
The total cost of the units transferred out is Rs 60750 + Rs 16875 + Rs 83125 = Rs 160750.
The cost of the units in the closing inventory is 13,500 units x Rs 4.50 per unit + 1750 units x Rs 1.25 per unit + 1750 units x Rs 2.50 per unit = Rs 6562.50.
Option B is incorrect because it is the cost of the units transferred out.
Option C is incorrect because it is the cost of the materials transferred in plus the cost of the additional materials added in process.
Option D is incorrect because it is the total cost of the units transferred out plus the cost of the units in the closing inventory.