Sharp EL9900 manual 1Access the Solver feature This screen will appear a few

EL-9900 Graphing Calculator

Solving a Literal Equation Using the Equation Method (Amortization)

The Solver mode is used to solve one unknown variable by inputting known variables, by three methods: Equation, Newton’s, and Graphic. The Equation method is used when an exact solution can be found by simple substitution.

Example

Solve an amortization formula. The solution from various values for known variables can be easily found by giving values to the known variables using the Equation method in the Solver mode.

The formula : P = L

		I	-N	-1
1-(1+			)
		12		P= monthly payment	I= interest rate
	I			L= loan amount	N=number of months
	12

1. Find the monthly payment on a $15,000 car loan, made at 9% interest over four

years (48 months) using the Equation method.

2. Save the formula as “AMORT”.

3. Find amount of loan possible at 7% interest over 60 months with a $300

payment, using the saved formula.

Before

Starting

There may be differences in the results of calculations and graph plotting depending on the setting. Return all settings to the default value and delete all data.

As the Solver feature is only available on the Advanced keyboard, this section does not apply to the Basic keyboard.

Step & Key OperationDisplayNotes

1-1Access the Solver feature.				This screen will appear a few
				seconds after “SOLVER” is dis-
	2nd F	SOLVER		played.
1-2Select the Equation method for
solving.
	2nd F	SOLVER	A
1
1-3Enter the amortization formula.

2nd F ALPHA P = L

ALPHA

	(		a/b		1	—		(	1		+
ALPHA			I		a/b	1	2			)
a	b	(	)		ALPHA	N
			-
ALPHA			I		a/b	1	2
			a			1
	)				-
				b

5-1