Consider the following product structure. 
If the demand for product A is 40 units, and there are 10 units of B on hand and none of C, how many units of part D will be needed?
Definitions:
Massachusetts Bay Colonists
The settlers of the Massachusetts Bay Colony, an English settlement on the east coast of North America in the 17th century.
New England Indians
Indigenous peoples living in the region known as New England, in the northeastern United States, prior to and during European colonization.
1630-1640
A decade during which significant migration to the American colonies occurred, particularly by Puritans to Massachusetts, marking a crucial development phase of early American society.
Chesapeake Region
An area surrounding the Chesapeake Bay, encompassing parts of Maryland and Virginia, significant in early American history for its tobacco cultivation and as a center of colonial society.
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