Express the inequality using interval notation. 
Definitions:
Crossover Rate
The point at which two projects have the same net present values and discounted cash flows, used in assessing investment options.
WACC
The Weighted Average Cost of Capital represents a calculation of a company's capital costs, where each capital category is weighted in proportion to its total makeup.
NPV
Net Present Value (NPV) is a financial metric that calculates the present value of all cash flows, both incoming and outgoing, associated with a project or investment.
Cash Flow
The total amount of money being transferred into and out of a business, affecting its liquidity, solvency, and operational capabilities.
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