The numbers of hours worked (per week) by 400 statistics students are shown below. 
The percentage of students who work at least 20 hours per week is
Definitions:
Salvage Value
Salvage value is the estimated resale value of an asset at the end of its useful life.
Equivalent Annual Annuity
The annual cash flow of an investment that yields the same present value as the investment’s costs, used in capital budgeting to compare the profitability of investments.
Payback
The period of time required for the return on an investment to "pay back" the initial capital outlay.
Cost of Capital
Cost of capital refers to the minimum rate of return a company must earn on its investments to satisfy its investors, creditors, and other providers of capital.
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