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The diagram to the right illustrates a hypothetical demand curve representing the relationship between price (in dollars per unit) and quantity (in 1,0005 of units per unit of time). The area of the triangle shown on the diagram is $D. (Enter your response as an integer.) Price (dollars per unit) 100 E15 Y II I' .I'. I I ll 10 20 3'0 4'0 5'0 6'0 7'0 8'0 9'01 Quantity (1,0005 of units per unit of time) 00