FEATURESProfit Analyzer.TAX+/TAX– Calculations12 Digit Adjustable Display Last Digit CorrectionDual Power: Solar power with Battery Back UpThe DD-820 is a 12 digit desktop calculator with a special feature that enpowers you to figure outCost, Sell & Gross Profit Margins quickly. It also calculates tax, tip,sur-charge added values of a fixed %with the TAX+ TAX- analysis.Profit Analyzer

DD-820

TM
TM
COSTCOSTSELLSELL
MARGIN
SELLCOSTMARGINMARGINGROSS PROFIT % (MARGIN)You bought an item for $10.00. You sold it for 15.00What is the Gross Profit Margin ?10.00 15.00 You made 33.33 % profit.SELLING PRICE (SELL)You bought an item at You would like to make 20% profitThis item should be sold for $ 15.00BUYING PRICE (COST)The item is sold at 90.00The seller made 15% profit 25How much was the cost for this item? $67.50
TAX
TAX
+
TAXTAX +COST COSTSELLSELL
MARGIN SELL COST
MARGIN MARGIN
Profit Analyzer Keys
TAX CALCULATIONS
Setting TAX rate at 15% The taxed price is $300SETTING THE TAX RATE 138.00 (Total Amount+Tax )
Once the TAX Rate is set, it will remain in memory until a new rate is entered
TAX
12.00 20The price is $120120Hold down % key for 3 seconds Key in rate
TAX
+
TAX
18.00 (Tax = 15% of 120 )
TAX
+
In order to see Tax amount press again and you will see the amount of Tax300 260.86 (The price before Tax)In order to see Tax amount press again you will see the amount of Tax Tip,Tax, Surcharge RateExample
15%
How much is the total bill including 15% Tax?
How much was the bill before Tax?
39.14 (Tax Amount)TAX AddedTAX SubtractedTELEDEX 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
Remove 3Screws onBack andlift coveroff

+

Located batteryHolderSlide battery to leftusing small screw driver.Then replacePER
C
ENT
C
AL
CU
LATI
ON
Percenta
g
es (%)
Pr
ess
Displayed
py
Exam
p
le
:
C
alculate
6%
of 1
00.
[1] [0] [0] x [6]
%
Exam
p
le
:
Add 6% tax to
$
20.
[
2
]
[
0
]
[
+
]
[
6
]
[
%
]
21.2
Exam
p
le
:
Calculate a
20% discount from
$
150
.
[
1
]
[
5
]
[
0
]
[
]
[
2
]
[
0
]
[
%
]
1
2
0
CO
N
S
TANT
C
AL
CU
LATI
O
N
S
Press = to re
p
eat last function.
Example:
xa
C
alculate
5
x
5
x
5
x
5
+ 2 + 2 =
6
2
9
Pr
ess
[
5
]
[
x
]
[
=
]
[
=
]
[
=
]
[
+
]
[
2
]
[
=
]
[
=
]
6
2
9
PERF
O
RMIN
G
C
AL
CU
LATI
O
N
S
Pr
ess
Displayed
py
Addition
(
+
)
Exam
p
le
:
6
+ 7 = 1
3.
[
6
]
[
+
]
[
7
]
[
=
]
1
3
Subtraction
(
)
Exam
p
le
:
1
0
4 =
6.
[
1
]
[
0
]
[
]
[
4
]
[
=
]
6
Multiplication
(
x
)
Exam
p
le
:
7 x
5
=
35.
[
7
]
[
x
]
[
5
]
[
=
]
35
Division
(
÷
)
Exam
p
le
:
14
÷
7
=
2.
[
1
]
[
4
]
[
÷
]
[
7
]
[
=
]
2
(12 x 5)÷
2
=
30
[
1][2][x][5][+/
/
/
][
÷
][
2
]
[
=
]
M
IN
US
30
1
5
2 +
38
= 1
90
[
1
][
5
][
2
][
+
][
3
][
8
][
=
]
1
90
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][=] 52SIMPLE E
Q
UATION
S
(F)Floating, Fixed(0,2,4), (A)accountant,(A) Add. Mode, (0,2,4) F420A5/4( ) An answer is rounded up(5/4) An answer is rounded off( ) An answer is rounded downDECIMAL POINT SELECTORROUND UP / DOWN SELECTOR
Use backspace key to delete the error digit.LAST DIGIT CORRECTIONEvery time the = key is pressed, the number in thedispla
y
is memorized and GRAND TOTAL appears in thedispla
y
. Press GT to displa
y
the sum of all memorizednumbers. Clear the grand total by pressing ON/AC
.
Example:Calculate A + B + C A = 6 x 7 B = 5 + 4 C = 22 5GRAND TOTAL GTPress ON/AC to turn on the calculator. The calculator turns off automatically after about 12 minutes if no key is pressed.
TURNING CALCULATOR ON & OFF ONAC
OPERATING CALCULATORChanges the displayed number from positive (+) to negative () or from negative () to positive (+). appears when the displayed value is negative.+/ KEY +/If the calculator is on, press ON/AC to reset the display to 0.
ON/AC KEY ONAC
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
[
6
]
[
X
]
[
7
]
[
=
]
42
[5] [+] [4] [=] 9[2] [2] [] [5] 17 68
GT
Pr
ess
Displayed
py
Pr
ess
Displayed
py
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.BATTERY REPLACEMENTCARE AND MAINTENANCEUSE ONE TYPE 389 BUTTON CELL BATTERY
www.datexx.com
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.