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TM
DD-820
The DD-820 is a 12 digit desktop calculator with a special
PERFORMING CALCULATIONS
feature that enpowers you to figure out
TM
Cost, Sell & Gross Profit Margins quickly.
Addition (+)
It also calculates tax, tip,sur-charge added values of a fixed %
Example: 6 + 7 = 13.
with the TAX+ TAX- analysis.
Subtraction (–)
FEATURES
Example: 10 – 4 = 6.
Profit Analyzer.
Multiplication (x)
TAX+/TAX– Calculations
Example: 7 x 5 = 35.
12 Digit Adjustable Display
Last Digit Correction
Division (÷)
Example: 14 ÷ 7 = 2.
Dual Power: Solar power with Battery Back Up
PERCENT CALCULATION
Percentages (%)
TURNING CALCULATOR ON & OFF
Example:
ON
AC
Calculate 6% of 100.
Press ON/AC to turn on the calculator.
Example:
The calculator turns off automatically after
Add 6% tax to $20.
about 12 minutes if no key is pressed.
Example: Calculate a
20% discount from $150. [1] [5] [0] [–] [2] [0] [%]
OPERATING CALCULATOR
CONSTANT CALCULATIONS
Press = to repeat last function.
DECIMAL POINT SELECTOR
Example:
xa
SIMPLE EQUATIONS
(F)Floating, Fixed(0,2,4), (A)accountant,
(A) Add. Mode, (0,2,4)
•
•
•
•
•
F 4 2 0 A
(12 x –5)÷ 2 = –30 [ 1][2][x][5][+/– /– / ][÷][2] [=]
Sets the number or digits that appear to the right of
152 + 38 = 190
the decimal point in the display. Example: 22 ÷ 7= ?
78 – 22 =
Switch
F
0
2
4
A
Display
3.14285. 3
3.14
3.1428
3.14
22 x 12 = 264
312 ÷ 6 =
ROUND UP / DOWN SELECTOR
GRAND TOTAL
( ) An answer is rounded up
Every time the = key is pressed, the number in the
(5/4) An answer is rounded off
display is memorized and GRAND TOTAL appears in the
( ) An answer is rounded down
•
•
•
5/4
display. Press GT to display the sum of all memorized
numbers. Clear the grand total by pressing ON/AC.
+/– KEY
+/–
Example:
Changes the displayed number from positive (+) to
Calculate
negative (–) or from negative (–) to positive (+).
A + B + C
– appears when the displayed value is negative.
A = 6 x 7
B = 5 + 4
ON/AC KEY
C = 22 – 5
ON
AC
If the calculator is on, press ON/AC to reset the display to 0.
MEMORY CALCULATION
[M+]
LAST DIGIT CORRECTION
[M–]
Use backspace key
to delete the error digit.
[MRC] Displays the number stored in Memory. Press twice
Profit Analyzer Keys
Press
Displayed
p y
MARGIN
COST
[6] [+] [7] [=]
13
SELL
[1] [0] [–] [4] [=]
6
GROSS PROFIT % (MARGIN)
[7] [x] [5] [=]
35
You bought an item for $10.00.
You sold it for 15.00
[1] [4] [÷] [7] [=]
2
What is the Gross Profit Margin ?
Press
Displayed
p y
SELLING PRICE (SELL)
[1] [0] [0] x [6] %
6
You bought an item at
[2] [0] [+] [6] [%]
21.2
You would like to make 20% profit
120
BUYING PRICE (COST)
Calculate 5 x 5 x 5 x 5 + 2 + 2 = 629
The item is sold at
Press [5] [x] [=] [=] [=] [+] [2] [=] [=]
629
The seller made 15% profit
How much was the cost for this item?
Press
Displayed
p y
–
30
MINUS
[ 1][5][2][+][3][8][=]
190
TAX CALCULATIONS
56
[ 7][8][–][2][2][=]
56
[ 2][2][x][1][2][=]
264
TAX
+
52
[ 3][1][2][÷][6][=]
52
SETTING THE TAX RATE
Example
Setting TAX rate at 15%
GT
Hold down %
Key in rate
Once the TAX Rate is set, it will remain in memory until a new rate is entered
TAX
TAX Added
+
Press
Displayed
p y
The price is $120
[6] [X] [7] [=]
42
[5] [+] [4] [=]
9
120
TAX
+
[2] [2] [–] [5]
17
In order to see Tax amount
press
TAX
GT
68
TAX
TAX Subtracted
The taxed price is $300
Add the displayed number into Memory.
300
TAX
M appears in the display.
Subtract the displayed number from Memory.
In order to see Tax amount
press
to clear Memory. M disappears from the display.
Profit Analyzer
BATTERY REPLACEMENT
SELL
COST
USE ONE TYPE 389 BUTTON CELL BATTERY
COST
SELL
MARGIN
MARGIN
MARGIN
COST
10.00
15.00
SELL
You made 33.33 % profit.
SELL
COST
12.00
20
MARGIN
This item should be sold for $ 15.00
COST
+
SELL
90.00
25
MARGIN
$67.50
CARE AND MAINTENANCE
• Keep the calculator dry. If it gets wet, dry it before use.
TAX
• Store the calculator at moderate temperatures.
Tip,Tax, Surcharge Rate
• Do not drop or strike the calculator.
key for 3 seconds
• Clean the calculator case only with a soft damp cloth.
1
5
%
Do not use harsh cleaning solvents to clean the unit.
• Keep the display and solar panel clean.
How much is the total bill including 15% Tax?
138.00 (Total Amount+Tax )
TELEDEX Limited U.S.A. Warranty
again and you will see the amount of Tax
+
TELEDEX INC. warrants these products to the original purchaser to
18.00 (Tax = 15% of 120 )
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.
How much was the bill before Tax?
TELEDEX INC. 1 Atlas st. Kenilworth, NJ 07033
260.86 (The price before Tax)
Warranty valid only in the U.S.A.
again you will see the amount of Tax
TAX
39.14 (Tax Amount)
Remove 3
Screws on
Back and
lift cover
off
Located battery
Holder
Slide battery to left
using small
screw driver.
Then replace
Printed in China 5/00
www.datexx.com
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