The demand function for a certain commodity is $p ( x ) = 4 - \frac { 1 } { 30 } x$ Find the consumer surplus when the sales level is 30.
A)90
B)45
C)15
D)70
E)30
F)60
G)20
H)80

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The Answer of The demand function for a certain commodity is $p ( x ) = 4 - \frac { 1 } { 30 } x$ Find the consumer surplus when the sales level is 30.
A)90
B)45
C)15
D)70
E)30
F)60
G)20
H)80

The Demand Function for a Certain Commodity Is p(x)=4−130xp ( x ) = 4 - \frac { 1 } { 30 } xp(x)=4−301​x

The Demand Function for a Certain Commodity Is $p ( x ) = 4 - \frac { 1 } { 30 } x$