for
Math 115b, Sections:
Instructor: Ratnayaka
Due Date: by
Team: (Number)
We, the undersigned, affirm that each of us participated fully and equally in the completion of this assignment and that the work contained herein is original. Furthermore, we acknowledge that sanctions will be imposed jointly if any part of this work is found to violate the Student Code of Conduct, the Code of Academic Integrity, or the policies and procedures established for this course.
______________________________
Name (printed)
______________________________
Name (printed)
______________________________
Name (printed)
______________________________
Name (printed)
______________________________
Signature
______________________________
Signature
______________________________
Signature
______________________________
Signature

(You must provide a printout of the excel formulas used, graphs, sample data & workings for the problems)
Problem 1 ( i ) Find the price, per dinner, that will result in the sale of 2,600 buffalo steak dinners. ( ii ) What revenue can be expected from 2,600 dinners?
Problem 2 Suppose that the demand function for a good is given by D ( q )
 
0 .
1
 q

150 . ( i ) Use Graphing.xls
to plot D ( q ) and the revenue function, R ( q ) . ( ii ) Estimate the price that will yield the greatest revenue.
Problem 3 Suppose that D ( q )
 
0 .
00006
 q
2 
250 is the demand function for a certain model of audio speaker. ( i ) Use Graphing.xls
to plot D ( q ) and the revenue function, R ( q ) . ( ii ) Estimate the price that will yield the greatest revenue.
Problem 4 The demand function for a new type of car alarm system is shown in the following plot.
DEMAND FUNCTION
500
400
300
200
100
0
0 100 200 300 400 500 600 q in K's
Note that the quantities sold are given in thousands . Estimate the revenue (in dollars) from selling 300,000 alarms.
*Problem 5 ( i
) Use your team’s data and
Trend Lines to find the formula for a quadratic demand function. ( ii )
Plot D ( q ) and R ( q ) for your team’s product. Use the same units as in the work on the class project in the sheet
Functions of Marketing Focus.xls
.
Problem 6 ( i ) Find the cost of preparing 1,500 buffalo steak dinners. ( ii ) What revenue can be expected from preparing and selling 1,500 dinners? ( iii ) What weekly profit can be expected from preparing and selling 1,500 dinners?
Problem 7 Estimate the percentage drop in weekly profit that would result from dropping the price of buffalo steak dinners from $22 to $20.
Problem 8 Suppose that the demand function for a good is given by D ( q ) =

0.1
 q + 150. Suppose that the fixed cost for producing this good is C
0

$ 12 , 000 and that the variable costs are given by VC ( q )

1300
 q .
( i ) Use Graphing.xls
to plot D ( q ) and P ( q ) . ( ii ) Use your graphs to estimate the number of units that should be produced, and how they should be priced in order to attain the maximum profit. ( iii ) Approximately what maximum profit might be expected?

Problem 9 Refer to the demand & cost functions whose graph is shown below.
DEMAND FUNCTION
COST FUNCTION
500
140
400
120
100
300
80
200 60
40
100
20
0
0
0 100 200 300 400 500 600
0 100 200 300 400 500 600 q in K's q in K's
Note that the quantities of alarms are given in thousands and the total costs are given in millions of dollars.
( i ) Estimate the number of alarms that would be sold at a price of $250 each. ( ii ) Estimate the revenue
(in dollars) that would result from the sale of alarms priced at $250. ( iii ) Estimate the cost (in dollars) of producing the alarms that would be sold at $250. ( iv ) Estimate the profit (in dollars) that would result from the sale of alarms at $250.
* Problem 10 ( i
) Use your team’s data to find the formula(piecewise function) for the cost function of your product. ( ii ) Plot C ( q ) { plot this function using the user defined COST function, you need to import this from
Marketing Focus.xls } and P ( q ) for your team’s data. Use the same units as in the work on the class project in the sheet Functions of Marketing Focus.xls
.