A detergent producing company produces detergents to be sold in 10 kg boxes. The production capacity of the company is 1700 tons/year. The total fixed expenses of the firm are 980 000 TL and the production cost per box is 19 TL. The selling price of 1 box of detergent is 39 TL. According to this, a) Since the annual interest is 8% and the tax rate is 20%, find the payback period. b) What is the cumulative cash situation of the company after 20 years when the tax and interest rate is as above? will it be?