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:
Economic Profits
Profits earned by a firm after accounting for both explicit and implicit costs, indicating the total returns exceeding the costs of all resources employed.
Economic Profit
The difference between a firm's total revenue and its total costs, including both the explicit and implicit costs, representing the financial gain exceeding the opportunity costs.
Total Revenue
The gross income of a company, which is the sum of money generated from its goods or services sold before deducting any costs.
Annual Salary
The total amount of money earned by an employee in a year from their job before taxes and other deductions.
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