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Profit Analyzer.
TAX+/TAX– Calculations
12 Digit Adjustable Display
Last Digit Correction
Dual Power: Solar power with Battery Back Up
The DD-820 is a 12 digit desktop calculator with a special
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.
Profit Analyzer
DD-820
TM
TM
COST
COST
SELL
SELL
MARGIN
SELL
COST
MARGIN
MARGIN
GROSS PROFIT % (MARGIN)
You bought an item for $10.00.
You sold it for 15.00
What 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% profit
This item should be sold for $ 15.00
BUYING PRICE (COST)
The item is sold at 90.00
The seller made 15% profit 25
How much was the cost for this item? $67.50
TAX
TAX
+
TAX
TAX
+
COST
COST
SELL
SELL
MARGIN
SELL
COST
MARGIN MARGIN
Profit Analyzer Keys
TAX CALCULATIONS
Setting TAX rate at 15%
The taxed price is $300
SETTING 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
20
The price is $120
120
Hold 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 Tax
300 260.86 (The price before Tax)
In order to see Tax amount
press again you will see the amount of Tax
Tip,Tax, Surcharge Rate
Example
1
5
%
How much is the total bill including 15% Tax?
How much was the bill before Tax?
39.14 (Tax Amount)
TAX Added
TAX Subtracted
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
Remove 3
Screws on
Back and
lift cover
off
+
Located battery
Holder
Slide battery to left
using small
screw driver.
Then replace
PER
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]
%
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][=] 52
SIMPLE E
Q
UATION
S
(F)Floating, Fixed(0,2,4), (A)accountant,
(A) Add. Mode, (0,2,4)
F420A
5/4
( ) An answer is rounded up
(5/4) An answer is rounded off
( ) An answer is rounded down
DECIMAL POINT SELECTOR
ROUND UP / DOWN SELECTOR
• • • • •
• • •
Use backspace key to delete the error digit.
LAST DIGIT CORRECTION
Every time the = key is pressed, the number in the
displa
y
is memorized and GRAND TOTAL appears in the
displa
y
. Press GT to displa
y
the sum of all memorized
numbers. Clear the grand total by pressing ON/AC
.
Example:
Calculate
A + B + C
A = 6 x 7
B = 5 + 4
C = 22 – 5
GRAND TOTAL
GT
Press 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
ON
AC
OPERATING CALCULATOR
Changes 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
ON
AC
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 REPLACEMENT
CARE AND MAINTENANCE
USE 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.