When 20 units of the end item are to be assembled, the additional units that are needed is 138 units.
Material requirements planning (MRP) is a tool for inventory and purchase planning that determines the amount of dependent demand items such as raw materials, components, and subassemblies required to make a finished commodity in accordance with its demand-driven production schedule.
E depends on the B, C & D and B, C & D depends on End Item.
To assemble the 20 units of End Item.
Net Requirement of B = 20*2 - 10 (On Hand) = 40 - 10 = 30 units
Net Requirement of C = 20*1 - 10 = 20 - 10 = 10 units
Net Requirement of D = 20*3 - 25 = 60 - 25 = 35 units
Now,
Net Requirement of E = B*2 + C*2 + D*2 - On Hand
Net Requirement of E = 30*2 + 10*2 + 35*2 - 12
Net Requirement of E = 60 + 20 + 70 - 12 = 138 units
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