Consider a material requirements planning problem for the finished product (PFinal) with the structure illustrated in the following figure:

The quantities in parentheses indicate the number of units required to produce one unit of the top tier. For PFinal, there is an inventory at the beginning of period 1 of 20 units and a planned minimum safety stock of 40 units at the end of each of the periods. All other parts and subassemblies have a starting inventory equal to zero (0) and a safety stock is not planned (safety stock = 0). The lead time for PFinal and for the subassemblies (Subassembly1 and Subassembly2) is equal to one (1) period. The delivery time for raw materials (MP1, MP2 and MP3) is equal to zero (0). Due to supplier requirements, for raw material MP1, purchase orders can only be placed every two (2) periods. The following table shows the demands that must be satisfied from the final product (PFinal).

Using the information above, what is the order size for the first vendor requisition for MP1?

PFinal Subensamble 1 (2) Subensamble 2 (1) MP1 (1) MP1 (1) MP2 (4) MP3 (2) Periodo 1 2 3 4 5 6 Demanda 80 120 60 100 200 200 PFinal Subensamble 1 (2) Subensamble 2 (1) MP1 (1) MP1 (1) MP2 (4) MP3 (2) Periodo 1 2 3 4 5 6 Demanda 80 120 60 100 200 200