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```2­4 Fixed and Variable Expenses.notebook
September 30, 2015
Bellwork 9-30-15
An economist is an expert who will know tomorrow why the things he predicted yesterday didn't happen today.
Laurence J. Peter, Professor
1. What expenses are involved in the manufacturing process?
2. Why does revenue depend on the price charged?
1
2­4 Fixed and Variable Expenses.notebook
2-4
September 30, 2015
FIXED AND VARIABLE EXPENSES
OBJECTIVES
Understand the difference between fixed and variable expenses. Create an expense equation based on fixed and variable expenses. 2
2­4 Fixed and Variable Expenses.notebook
Key Terms
• variable expenses
-expenses that depend on
the number of items
produced, raw materials
• fixed expenses
-expenses that do not
change based on
production, machinery
• expense equation
-the sum of the fixed and
variable expenses
• revenue
September 30, 2015
• revenue equation
R=pq, where R is revenue,
p is the price, and q is
the quantity sold
• profit
-the POSITIVE
difference obtained when
expenses are subtracted
from revenue
• loss
-the NEGATIVE
difference obtained when
expenses are subtracted
from revenue
• breakeven point -when expenses and
revenue are EQUAL, no
profit and no loss
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2­4 Fixed and Variable Expenses.notebook
September 30, 2015
Example 1
The art students have researched all of their potential expenses. The fixed expenses are \$17,600. The labor and materials required for each pair of painted jeans produced cost \$7.53. Represent the total expenses as a function of the quantity produced, q.
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2­4 Fixed and Variable Expenses.notebook
September 30, 2015
A widget manufacturer’s expense function is E = 6.00q + 11,000. What are the variable costs to produce one widget?
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2­4 Fixed and Variable Expenses.notebook
September 30, 2015
EXAMPLE 2
Kivetsky Ski Supply manufactures hand warmers for skiers. The expense function is E = 1.18q + 12,000. Find the average cost of producing one pair of hand warmers if 50,000 hand warmers are produced.
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2­4 Fixed and Variable Expenses.notebook
September 30, 2015
The expense function for a certain product is E = 3.40q + 189,000. Express the average cost of producing q items algebraically.
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2­4 Fixed and Variable Expenses.notebook
September 30, 2015
EXAMPLE 3
Willie’s Widgets has created a demand function for its widgets, where q is the quantity demanded and p is the price of one widget q = –112p + 4,500. Its expense function is E = 3.00q + 18,000. Express the expense function as a function in terms of p.
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2­4 Fixed and Variable Expenses.notebook
b
September 30, 2015
A corporation’s expense function is E = 4.00q + 78,000. The demand function was determined to be q = –4p + 3,000. Express E in terms of p.
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2­4 Fixed and Variable Expenses.notebook
September 30, 2015
EXAMPLE 4
Wally’s Widget World created a monthly expense equation, E = 1.10q + 4,200. Wally’s Widget World plans to sell its widgets to retailers at a wholesale price of \$2.50 each. How many widgets must be sold to reach the breakeven point?
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2­4 Fixed and Variable Expenses.notebook
September 30, 2015
If the company sells 2,900 widgets, is Wally’s Widget World operating above or below the breakeven point? What is the difference between revenue and expense? 11
2­4 Fixed and Variable Expenses.notebook
September 30, 2015
Find the breakeven point for the expense function, E = 5.00q + 60,000, and the revenue function, R = 7.00q. 12
2­4 Fixed and Variable Expenses.notebook
September 30, 2015
Homework: Page 84-85, 3-12
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