Assume that when price is $20,quantity demanded is 9 units,and when price is $19,quantity demanded is 10 units.Based on this information,what is the marginal revenue resulting from an increase in output from 9 units to 10 units?
A)$20
B)$19
C)$10
D)$1

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The Answer of Assume that when price is $20,quantity demanded is 9 units,and when price is $19,quantity demanded is 10 units.Based on this information,what is the marginal revenue resulting from an increase in output from 9 units to 10 units?
A)$20
B)$19
C)$10
D)$1

Assume That When Price Is $20,quantity Demanded Is 9 Units,and