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Mathematics
Mathematics
Problem
The total cost (in rupees) of producing
x
x
x
units of an item is
C
(
x
)
=
x
2
+
20
x
+
36
C(x)=x^{2}+20x+36
C
(
x
)
=
x
2
+
20
x
+
36
. For what value of
x
x
x
is the average cost
C
(
x
)
x
\dfrac{C(x)}{x}
x
C
(
x
)
minimised? a)
8
8
8
b)
6
6
6
c)
10
10
10
d)
4
4
4
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