JKL Enterprises is evaluating the purchase of new machinery to expand its production capacity. The data for the machines under consideration is as follows. The corporate tax rate is 32%, and the interest on capital is 10%.

Particulars	Machine Alpha (Rs)	Machine Beta (Rs)	Machine Gamma (Rs)
Initial Investment	8,00,000	9,00,000	10,00,000
Estimated Annual Sales	11,00,000	12,00,000	13,00,000
Cost of Production:
Direct Material	1,00,000	1,10,000	1,20,000
Direct Labour	1,10,000	1,20,000	1,30,000
Factory Overhead	1,30,000	1,40,000	1,50,000
Administration Cost	50,000	55,000	60,000
Selling & Distribution Cost	40,000	45,000	50,000

The economic life of Machine Alpha is 7 years, while it is 8 years for the other two. The scrap values are Rs. 90,000, Rs. 1,00,000, and Rs. 1,10,000 respectively. Calculate the payback period for each machine to determine the best investment.