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KEAM 2011 Math Paper
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© examsnet.com
Question : 50
Total: 120
The total revenue in rupees received from the sale of x units of a product is given by
R
(
x
)
=
13
x
2
+
26
x
+
15.
Then the marginal revenue in rupees, when
x
=
15
is
116
126
136
416
146
Validate
Solution:
Given,
R
(
x
)
=
13
x
2
+
26
x
+
15
Now,
=
d
d
x
(
R
(
x
)
)
=
d
d
x
(
13
x
2
+
26
x
+
15
)
=
26
x
+
26
Therefore, marginal revenue at
(
x
=
15
)
=
26
×
15
+
26
=
390
+
26
=
416
© examsnet.com
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