A block is at rest on a rough incline as shown. 
The frictional force acting on the block,along the incline,is
Definitions:
Discount Rate
The interest rate charged to commercial banks and other financial institutions for loans received from a country's central bank.
Present Value
The present worth of a future sum of money or series of cash flows, based on a given return rate.
Cash Today
Cash Today refers to the availability of funds or capital that can be immediately used or invested, as opposed to future earnings or receivables.
Rate of Return
The augmentation or diminution in an investment's valuation across a specified timeframe, articulated as a fraction of the initial investment expense.
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