Skip to main content
Print this chapter
Pricing
Exercies
Answers
c
d
d
b
a
a
c
d
a
d
a
a
d
d
a
d
a
b
a
a
c
a
c
c
b
d
d
d
a
a
b
b
b
b
c
a
b
d
d
b
b
d
d
d
b
d
a
b
a
a
a
b
d
c
b
d
b
b
a
c
a
b
c
c
a
d