HP 48g Graphing Calculator - Manual (Page 219)

See 14-17 for additional approaches to testing the accuracy of a
computed array solution.
Using the Finance Solver
The Finance Solver application provides time-value-of-money (TVM)
and amortization capabilities. You can use it for compound-interest
and amortization calculations.
Compound interest occurs when earned interest is added to the
principal at specified compounding periods, and then the combined
amount earns interest. Many financial calculations are compound
interest calculations—for example, savings accounts, mortgages,
pension funds, leases, and annuities.
Time Value of Money calculations, as the name implies make use the
notion that “time is money.”—that a dollar now is worth more than a
dollar at some time in the future. A dollar now can be invested and
generate a return that the dollar-in-the-future cannot. This TVM
principle underlies the notion of interest rates, compound interest and
rates of return.
TVM transactions can be represented and understood by using cash
fl.ow diagrams. A cash flow diagram is a time line divided into equal
segments representing the compounding periods. Arrows represent the
cash flows. Money received is a positive value, and money paid out is
a negative value.
The cash flow diagram for a transaction depends on the point of view
you take in your problem statement. For example, a loan is an initial
positive cash flow for the borrower, but it’s an initial negative cash
flow for the lender.
18
Solving Equations 18-13