1000 kg of art board valued at Rs. 5,000 were issued for the manufacture of medium-sized cartons. The details are as follows: 

1. 1000 Nos medium-sized cartons weighing 0.50 kg each were manufactured. 

2. 250 kg of off-cuts were used for the manufacture of small-sized carton. This would have amounted to Rs. 500. 

3. 150 medium-sized cartons were damaged and rectifi cation costs came up to Rs. 100. 

4. 50 kg of off-cuts were sold as scrap for Rs. 10.

You are required to calculate the cost of one medium-sized carton, assuming that there are no opening and closing stocks.