Engineering Economics
In what method of computing depreciation where it assumes that the annual cost of depreciation is a fixed percentage of the book value at the beginning of the year?

Declining balance method
Sum-of-year digit method
Sinking fund method
Straight line method

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Engineering Economics
In a cash flow series:

All of these
The gradient in the cash flow may be positive or negative
Uniform gradient signifies that an income or disbursement changes by the same amount in each interest period
Either an increase or decrease in the amount of a cash flow is called the gradient

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