(

,i

3)

A

developer

estimates

the

profit

from

the sale

of x units of

land

is

n(x)=

x(121x)2

a)

Findthemarginal

profit

at x:5.

b)

How

many

units must

be soldfor

mrudmum

p.rofit?

c)

What

is the

manimum

profit?

4)

Determine

the

producers' surplus

for the

supply

fimction,

p

:5

+

(n

^l;

,

if the

value of

x

at equilibrium

is 144.