If the following jobs are sequenced according to the DDATE rule then the mean completion time (in days) for all jobs is (assume zero for today's date) 
Definitions:
Rational Decisions
Choices made by individuals that align with their own self-interest and are based on an evaluation of the costs and benefits of the action.
Marginal Costs
The extra financial burden of generating one additional unit of a good or service.
Marginal Benefits
The incremental satisfaction or advantage obtained from the consumption of an additional unit of a good or service.
Marginal Cost
Marginal cost is the increase in total production cost that arises from producing one additional unit of a good or service.
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