The curve 
cross itself at some point 
. Find the equations of both tangent lines at that point.
Definitions:
Net Present Value
A calculation that determines the current value of a series of future cash flows, discounting them by a specified rate to evaluate investments or projects.
Present Value
The present value of a future amount of money or series of cash flows, based on a particular rate of return.
Future Cash Inflows
Projected cash earnings from investments, operations, or financial instruments over a specified future period.
Net Present Value
A method of evaluating the profitability of an investment by calculating the difference between the present value of cash inflows and outflows over a period of time.
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