HP HP-18C - Page 141

You can enter one or two guesses. If you enter one guess, the solver
makes a second guess. If you enter two guesses, the solver starts
searching for a solution in the range between the two guesses. The
solver works most efficiently when the answer is between your two
guesses. For example, if you
know the answer is between 5 and 12,
you
should enter 5 and 12 as the starting guesses.
To enter one guess, key in the value and press the menu key twice.
For example, 4.5
.... enters 4.5 as a guess for a user-variable
named A and starts the calculation.
To enter two guesses:
1. Key in the first guess and press the menu key.
2. Key in the second guess and press the menu key twice.
For example 0
.. 100 .... causes the solver to search for
A in
the range 0 through 100.
Example: Using guesses in a numerical solution. One formula
for calculating the profit from a manufacturing operation is:
Profit
= Price x Quantity - Variable costs
x
Quantity - Fixed Costs
The C-Sharp Piano Corporation sells pianos for $6,000. Variable costs
are $4,100; fixed costs
per year are $112,000. How many pianos must
C-Sharp sell this year in order to earn a profit of $130,0007 (In past
years, C-Sharp has had to sell between 100 and 200 pianos to make
an acceptable profit. You can use this information as initial guesses.)
9: The Formula Solver 139