Answer and Explanation:
 The computation of the payback period for each product line is as follows
  (in dollars)
Year Liquid Soap Cumulative Body lotion Cumulative 
1 170,000 170,000 90,000 90,000 
2 150,000 320,000 90,000 180,000 
3 120,000 440,000 90,000 270,000 
4 100,000  540,000  90,000 360,000 
5 70,000 610,000 90,000 450,000 
6 40,000 650,000 90,000  540,000 
7 40,000 690,000 90,000 630,000 
8 30,000 720,000 90,000 720,000
So, the Payback period for Liquid soap is 4 years and Payback Period for Body Lotion is 6 Years respectively
Therefore we suggest liquid soap as it contains better paypack period as compared with the body lotion