The diagram below identifies the elements of service as provided by a soft drink vending machine.Each element has an estimate of its own reliability,independent of the others.What is the reliability of the "system"? 
Definitions:
Net Present Value
A calculation used to evaluate the profitability of an investment, subtracting the present values of cash outflows from the present values of cash inflows.
Binary Variable
A variable that takes on one of exactly two possible values, typically represented or coded as 0 and 1.
Processes
A series of actions or steps taken in order to achieve a particular end, often referring to sequences in manufacturing or computation.
Solver
A computational tool used in spreadsheet programs to find optimal solutions to complex decision-making problems by changing multiple variables.
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