1. Shelby is an entrepreneur who has decided to open a small advertising firm. She rents office space at a cost of $25,000 per year, she has employed an assistant at a salary of $30,000 per year, and she incurs annual utility and office supply expenses of $20,000. Her best alternative is to work elsewhere and to earn a salary of $50,000 per year. How much annual revenue must her firm receive so that Shelby earns zero economic profit?

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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1. Shelby is an entrepreneur who has decided to open a small advertising firm. She rents office space at a cost of $25,000 per year, she has employed an assistant at a salary
of $30,000 per year, and she incurs annual utility and office supply expenses of $20,000. Her best alternative is to work elsewhere and to earn a salary of $50,000 per year.
How much annual revenue must her firm receive so that Shelby earns zero economic profit?
2. If a firm's total costs are $100 when 10 units of output are produced and $103 when 11 units of output are produced, the marginal cost of the 11th unit is?
3. Nimbus, Inc., makes brooms and then sells them door-to-door. Here is the relationship between the number of workers and Nimbus's output during a given day:
Nimbus, Inc.
Marginal Product
Total Cost
Average Total Cost
Marginal Cost
Workers
Output
1
2
3
4
20
50
90
120
140
150
155
a. Fill in the column of marginal products.
b. A worker costs $100 a day, and the firm has fixed costs of $200. Use this information to fill in the column for the total cost.
C. Fill in the column for the average total cost.
d. Now fill in the column for marginal cost.
Transcribed Image Text:1. Shelby is an entrepreneur who has decided to open a small advertising firm. She rents office space at a cost of $25,000 per year, she has employed an assistant at a salary of $30,000 per year, and she incurs annual utility and office supply expenses of $20,000. Her best alternative is to work elsewhere and to earn a salary of $50,000 per year. How much annual revenue must her firm receive so that Shelby earns zero economic profit? 2. If a firm's total costs are $100 when 10 units of output are produced and $103 when 11 units of output are produced, the marginal cost of the 11th unit is? 3. Nimbus, Inc., makes brooms and then sells them door-to-door. Here is the relationship between the number of workers and Nimbus's output during a given day: Nimbus, Inc. Marginal Product Total Cost Average Total Cost Marginal Cost Workers Output 1 2 3 4 20 50 90 120 140 150 155 a. Fill in the column of marginal products. b. A worker costs $100 a day, and the firm has fixed costs of $200. Use this information to fill in the column for the total cost. C. Fill in the column for the average total cost. d. Now fill in the column for marginal cost.
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