If the following jobs are sequenced according to the SPT rule,then the mean completion time (in days) for all jobs is (assume zero for today's date) 
Definitions:
Individual Producer
A single entity or person that creates goods or provides services in an economy.
Market Power
Refers to the ability of a firm or group of firms to manipulate the price and output levels in the market to their advantage.
Supply
The total amount of a specific good or service available to consumers at a given price level.
Input Market
The input market is the marketplace where companies or individuals procure resources, such as raw materials, labor, and services, needed to produce goods or offer services.
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