Share
Explore BrainMass

# Derivatives and Maximum Profit

3. Parcel Post

A firm wishes to use the services of a parcel delivery company to transport a cylindrical package. The package has volume V=pr2l, where l is the length of the package in metres and r is the radius of the circular end in metres. The parcel delivery company will only transport parcels provided that the sum of the length and diameter of a parcel is not more than 2 metres. The firm wishes to maximise the volume of the package.

(a) Explain why l=2-2rif we want to maximize V.

(b) Show that the quantity to be maximised is V=2pr2-2pr3.

(c) Calculate Dv/dr and d2V/dr2

(d) Find the stationary points of V and determine their nature. Hence state the maximum volume of the cylinder (correct to 2 decimal places).

(e) Sketch the graph of V as a function of r.

#### Solution Preview

Please see the attached file for the complete solution.
Thanks for using BrainMass.

The problem is to maximize with respect to the constraints .
(a) I claim that if ...

#### Solution Summary

Derivatives are used to find maximum profit. The firm's wishes to maximize the volume of the package is determined.

\$2.19