ABC Corporation has decided to purchase a machine to enhance the company's production capacity to meet increasing market demand. There are three machines under consideration. The relevant details including estimated yearly expenditure and sales are given below. All sales are on cash basis. Corporate income-tax rate is 35%. Interest on capital may be assumed to be 8%.

Particulars	Machine A (Rs)	Machine B (Rs)	Machine C (Rs)
Initial investment	4,00,000	3,50,000	4,50,000
Estimated annual sales	6,00,000	5,50,000	6,50,000
Cost of production:
Direct material	50,000	45,000	55,000
Direct labour	60,000	55,000	65,000
Factory overhead	70,000	60,000	75,000
Administration cost	25,000	20,000	30,000
Selling & Distribution cost	15,000	12,000	18,000

The economic life of machine A is 3 years, while it is 4 years for the other two. The scrap values are Rs. 50,000, Rs. 40,000 and Rs. 60,000 respectively. Find out the most profitable investment based on the payback period method.