XYZ Automobiles Ltd. has provided the following cost data for different levels of production:

Particulars of Costs	500 units	1,000 units	1,500 units
Direct Material	₹7,50,000	₹15,00,000	₹22,50,000
Direct Labour	₹5,00,000	₹10,00,000	₹15,00,000
Total Factory Overheads	₹10,00,000	₹20,00,000	₹30,00,000

You are required to calculate:

1. The total cost at an activity level of 1,200 units.
2. The cost per unit at this activity level.
3. The selling price per unit if a profit margin of 30% on cost is desired.
4. The variable cost per unit if the fixed overheads are ₹5,00,000 per month.