If the following jobs are sequenced according to the SLACK rule then the mean completion time (in days) for all jobs is (assume zero for today's date) 
Definitions:
Trading Cards
Collectible cards, typically related to sports, films, or video games, that feature images and information and are traded among fans.
Consumer Surplus
The contrast between what consumers are equipped and willing to dish out for a good or service against what they genuinely pay.
Total Utility
The overall satisfaction or utility a consumer derives from consuming a certain quantity of goods or services.
Philosopher-Economist
An individual who contributes to the fields of philosophy and economics, often analyzing the ethical implications of economic theories or decisions.
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