The pear company sells pphones. the cost to manufacture
x
pphones is
c
(
x
)
=
−
30
x
2
+
69000
x
+
19438
dollars (this includes overhead costs and production costs for each pphone). if the company sells
x
pphones for the maximum price they can fetch, the revenue function will be
r
(
x
)
=
−
39
x
2
+
321000
x
dollars.

how many pphones should the pear company produce and sell to maximimze profit? (remember that profit=revenue-cost.)

x=