m
a
r
g
i
n
a
l
c
o
s
t
s
o
f
t
h
e
f
i
r
s
t
p
l
a
n
t
:
M
C
(
q
)
=
a
1
+
b
1
q
=
1
0
+
2
0
q
a
1
1
0
b
1
2
0
m
a
r
g
i
n
a
l
c
o
s
t
s
o
f
t
h
e
s
e
c
o
n
d
p
l
a
n
t
:
M
C
(
q
)
=
a
2
+
b
2
q
=
6
0
+
5
q
a
2
6
0
b
2
5
D
D
3
d
e
m
a
n
d
a
n
d
m
a
r
g
i
n
a
l
r
e
v
e
n
u
e
m
a
r
g
i
n
a
l
c
o
s
t
s
o
f
t
h
e
f
i
r
s
t
p
l
a
n
t
m
a
r
g
i
n
a
l
c
o
s
t
s
o
f
t
h
e
s
e
c
o
n
d
p
l
a
n
t
t
o
t
a
l
m
a
r
g
i
n
a
l
c
o
s
t
s
o
p
t
i
m
a
l
q
u
a
n
t
i
t
i
e
s
Q
=
7
.
0
0
;
M
C
=
7
8
.
0
0
q
1
=
3
.
4
0
;
q
2
=
3
.
6
0