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Mathematics
Problem
A firm faces the price–demand relation
p
(
q
)
=
100
−
0.2
q
p(q)=100-0.2q
p
(
q
)
=
100
−
0.2
q
, where
p
p
p
is the price (in dollars) and
q
q
q
is the number of units sold. Revenue is
R
(
q
)
=
q
p
(
q
)
R(q)=qp(q)
R
(
q
)
=
q
p
(
q
)
. What is the marginal revenue, in dollars per unit, when
q
=
150
q=150
q
=
150
? a)
70
70
70
b)
40
40
40
c)
−
30
-30
−
30
d)
60
60
60
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