If the following jobs are sequenced according to the first-come-first-served (FCFS) rule, then the mean completion time in days for all jobs is (assume zero for today's date) 
Definitions:
LIFO Assumption
An inventory valuation method in which the last items purchased or produced are the first to be expensed (Last In, First Out).
Perpetual Inventory
A method of accounting for inventory that records the sale or purchase of inventory immediately through the use of computerized point-of-sale systems and enterprise asset management software.
Retail Inventory Method
An accounting method used to estimate the ending inventory balance of a retail store by applying a cost-to-retail price ratio to the sales for the period.
Balance Sheet
A financial statement that provides a snapshot of a company's financial position, including assets, liabilities, and shareholders' equity at a specific point in time.
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