Tingly takes two a day vitamins which are delivered to his home by routeman seven days after an order is called in. At what point should Tingly reorder?

 Tingly takes two a day vitamins which are delivered to his home by routeman seven days after an order is called in. At what point should Tingly reorder?

Solution:

Usage is 2 vitamins per day

 Lead time is 7 days

 ROP = (2) (7) = 14 vitamins 

Thus, Tingly should reorder when 14 vitamin tables are left.