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Mathematics
Problem
A manufacturer’s cost (in dollars) to produce
q
q
q
units of a product is given by
C
(
q
)
=
0.5
q
3
−
6
q
2
+
15
q
+
100
C(q)=0.5q^{3}-6q^{2}+15q+100
C
(
q
)
=
0.5
q
3
−
6
q
2
+
15
q
+
100
for
q
≥
0
q\ge 0
q
≥
0
. At what production level does the marginal cost change from decreasing to increasing? a)
q
=
6
q=6
q
=
6
b)
q
=
4
q=4
q
=
4
c)
q
=
2
q=2
q
=
2
d)
q
=
8
q=8
q
=
8
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