Datexx DD-820 warranty Turning Calculator on & OFF on, Battery Replacement, Care and Maintenance

TMDD-820

The DD-820 is a 12 digit desktop calculator with a special TM feature that enpowers you to figure out

Cost, Sell & Gross Profit Margins quickly.

It also calculates tax, tip,sur-charge added values of a fixed % with the TAX+ TAX- analysis.

FEATURES

Profit Analyzer.

TAX+/TAX– Calculations

12 Digit Adjustable Display

Last Digit Correction

Dual Power: Solar power with Battery Back Up

TURNING CALCULATOR ON & OFF ON

AC

Press ON/AC to turn on the calculator. The calculator turns off automatically after about 12 minutes if no key is pressed.

OPERATING CALCULATOR

PERFORMING CALCULATIONS

Addition (+)		Press		Displayed
Example: 6 + 7 = 13.		[6]	[+] [7] [=]	13
Subtraction (–)
Example: 10 – 4 = 6.		[1]	[0] [–] [4] [=]	6
Multiplication (x)
Example: 7 x 5 = 35.		[7]	[x] [5] [=]	35
Division (⎟ )
Example: 14 ⎟ 7 = 2.		[1]	[4] [⎟ ] [7] [=]	2
PERCENT CALCULATION
Percentages (%)		Press		Displayed
Example:
Calculate 6% of 100.		[1] [0] [0] x [6] %		6
Example:
Add 6% tax to $20.		[2] [0] [+] [6] [%]		21.2
Example: Calculate a
20% discount from $150.		[1] [5] [0] [–] [2] [0] [%]		120
CONSTANT CALCULATIONS

Profit Analyzer Keys

	MARGIN	SELL	COST
	COST	COST	SELL
	SELL	MARGIN	MARGIN
GROSS PROFIT % (MARGIN)					MARGIN
	You bought an item for $10.00.			10.00	COST
	You sold it for 15.00			15.00	SELL
	What is the Gross Profit Margin ?
			You made 33.33 % profit.
SELLING PRICE (SELL)					SELL
	You bought an item at			12.00	COST
	You would like to make 20% profit			20	MARGIN
		This item should be sold for $ 15.00

Profit Analyzer

BATTERY REPLACEMENT

USE ONE TYPE 389 BUTTON CELL BATTERY

Remove 3 Screws on Back and lift cover off

Located battery

Holder

DECIMAL POINT SELECTOR

(F)Floating, Fixed(0,2,4), (A)accountant,

(A) Add. Mode, (0,2,4)	•	•	•	•	•
	F	4	2	0	A

Sets the number or digits that appear to the right of the decimal point in the display. Example: 22 ⎟ 7= ?

Switch	F	0	2	4	A
Display	3.14285.	3	3.14	3.1428	3.14

ROUND UP / DOWN SELECTOR

( ) An answer is rounded up
(5/4) An answer is rounded off
( ) An answer is rounded down
	• • •
	5/4
+/– KEY		+/–

Changes the displayed number from positive (+) to negative (–) or from negative (–) to positive (+).

– appears when the displayed value is negative.

Press = to repeat last function.
Ex		a	mple: Calculate 5 x 5 x 5 x 5 + 2 + 2 = 629
			Press [5]		[x] [=] [=]	[=] [+] [2]	[=] [=]	629
SIMPLE EQUATIONS
(12 x –5)⎟2 = –30					Press		Displayed
					[1][2][x][5][+/	][⎟ ][2] [=]	–MINUS	30
152 + 38 = 190					[1][5][2][+][3][8][=]			190
78 – 22 =				56	[7][8][–][2][2][=]			56
22 x 12 =				264	[2][2][x][1][2][=]			264
312 ⎟ 6 =				52	[3][1][2][⎟ ][6][=]			52

GRAND TOTAL GT

Every time the = key is pressed, the number in the display is memorized and GRAND TOTAL appears in the display. Press GT to display the sum of all memorized numbers. Clear the grand total by pressing ON/AC.

Example:	Press		Displayed
Calculate	[6]	[X] [7] [=]	42
A + B + C	[5]	[+] [4] [=]	9
	[2]	[2] [–] [5]	17

BUYING PRICE (COST)		COST
The item is sold at	90.00	SELL
The seller made 15% profit	25	MARGIN
How much was the cost for this item?	$67.50

TAX CALCULATIONS

TAX	TAX
+		Tip,Tax, Surcharge Rate
SETTING THE TAX RATE
Example Setting TAX rate at 15%
Hold down	% key for 3 seconds
Key in rate	1 5 %

Once the TAX Rate is set, it will remain in memory until a new rate is entered

TAX TAX Added

+

The price is $120 How much is the total bill including 15% Tax?

120	TAX	138.00 (Total Amount+Tax )
	+

+	Slide battery to left
	using small
	screw driver.
	Then replace

CARE AND MAINTENANCE

•Keep the calculator dry. If it gets wet, dry it before use.

•Store the calculator at moderate temperatures.

•Do not drop or strike the calculator.

•Clean the calculator case only with a soft damp cloth. Do not use harsh cleaning solvents to clean the unit.

•Keep the display and solar panel clean.

ON/AC KEY ON

AC

If the calculator is on, press ON/AC to reset the display to 0.

LAST DIGIT CORRECTION

Use backspace key to delete the error digit.

A = 6 x 7
B = 5 + 4	GT	68
C = 22 – 5

MEMORY CALCULATION

[M+] Add the displayed number into Memory. M appears in the display.

[M–]Subtract the displayed number from Memory. [MRC] Displays the number stored in Memory. Press twice

to clear Memory. M disappears from the display.

In order to see Tax amount

	press		+				again and you will see the amount of Tax
				TAX
								18.00 (Tax = 15% of 120 )
TAX		TAX Subtracted
The taxed price is $300								How much was the bill before Tax?
300			TAX			260.86 (The price before Tax)
		In order to see Tax amount
		press			TAX again you will see the amount of Tax

39.14 (Tax Amount)

TELEDEX Limited U.S.A. Warranty

TELEDEX INC. warrants these products to the original purchaser to be free from defective material and workmanship. The product will be repaired or replaced at our option, for up to one year when returned with proof of purchase to the address below. Include a check or money order for $3.00 to cover postage.

TELEDEX INC. 1 Atlas st. Kenilworth, NJ 07033

Warranty valid only in the U.S.A. Printed in China 5/00

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