# The sales of a product S(in thousands of dollars) are given by S= 600x/x+40 where x is the advertising expenditure(in thousands of dollars) (a) Find the rate of change of sales with respect to advertising expenditure. (b) Use the second derivative to find how this rate is changing at x=20. (c) Interpret your result in part (b).

Question

The sales of a product S(in thousands of dollars) are given by

S= 600x/x+40

where x is the advertising expenditure(in thousands of dollars)

(a) Find the rate of change of sales with respect to advertising expenditure.

(b) Use the second derivative to find how this rate is changing at x=20.

(c) Interpret your result in part (b).

## Expert Answer

### Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times vary by subject and question complexity. Median response time is 34 minutes and may be longer for new subjects.
Tagged in
MathCalculus

### Other © 2021 bartleby. All Rights Reserved.