Given the portion of the network diagram shown below,where numbers in boxes show the task times,what is the earliest finish time for task C,if the earliest start time for task A is 10,and the earliest start time for task B is 13? 
Definitions:
Gross Profit
The financial gain made after subtracting the cost of goods sold from total sales revenue.
Ending Inventory
The estimation of goods on hand for sale at the termination of an accounting period, figured by the formula: starting inventory plus acquisitions minus the cost of goods sold.
Inventory Turnover Ratio
A measure of how rapidly inventory is sold or used in a given period, calculated by dividing cost of goods sold by average inventory.
Days' Sales
Often refers to days' sales outstanding (DSO), which measures the average number of days it takes a company to collect payment after a sale has been made.
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