merchandise store:
level 1 costs 5K per week is income is 10K a week which is 5K profit a week
level 2 costs 10K per week, income 17,500. which is 7,500 profit per week
level 3 costs 15K per week, income 23,750 which is 8,750 profit per week
Assuming you take all levels immediately
level 1 breaks even after 101 weeks
level 2 is profitable after 108 weeks and is more profitable than level 1 after 122 weeks
level 3 is profitable after 116 weeks and is more profitable than level 2 after 162 weeks