Thank you for purchasing your new Aurora DT830P calculator, please remove and recycle all packaging and
carefully remove the printed overlay from the screen of the calculator
Instructions and FAQ’s:
1. Turning your calculator on and off.
Your calculator is equipped with a patented ‘direct number input’ feature, which allows you to press ‘any’
key to turn your calculator on, should you press a number key, then this number will also register in the
display. The calculator is equipped with an ‘auto off’ feature and will power down by itself after a period
2. What are the COST, SELL and MARGIN keys for?
These buttons allow you to calculate ‘gross profit margin’ and your required cost or sell prices. There are
3 variables - Cost, Sell and Margin, if you input two of these variables the calculator will automatically
solve the third.
My cost is 30, I will sell for 60 – what gross profit margin am I making?
[Input 3, 0, COST, 6, 0, SELL] – The answer will be displayed as 50%
My cost is 30, I want to make 50% gross profit – what should I sell it for?
[Input 3, 0, COST, 5, 0, MARGIN] – The answer will be displayed as 60
I will sell for 60 and want to make 50% gross profit – what should my cost be?
[Input 6, 0, SELL, 5, 0, MARGIN] – The answer will be displayed as 30
After you have solved any third variable you can review all 3 variables by pressing the cost, sell and
margin keys again.
3. What are the ‘+TAX’ and ‘–TAX’ keys for?
These buttons allow you to add or deduct a user definable percentage at the touch of a button. A
common use for these buttons is too add or deduct sales tax.
Firstly you need to set the tax rate.
Example – Setting a tax rate of 19%
[Input 1, 9, RATE, SET] – The SET key is on the same key as ‘+TAX’ .
The tax rate is now set at 19% and will remain in the memory until you change it even when the
calculator turns off. Now you have set you tax rate you can simply add or deduct tax easily by using the
‘+Tax’ and ‘-Tax’ Keys
Example1 – The price is 60 including 19% sales tax, what is the price exclusive of tax?
[Input 6, 0, -TAX] – The answer is displayed as 50.42
Example 2 – The price is 60 excluding 19% sales tax, what is the price including tax?
[Input 6, 0, +TAX] – The answer is displayed as 71.40.
You can also view the actual tax content and the total by pressing the same tax key again.
You can also review the currently programmed Tax rate by pressing ‘RATE’ and ‘RECALL’ (the recall key is
on the same key as the ‘-TAX’ key) the currently set tax rate will be displayed on the screen.
4. How do the memory keys work?
Your calculator has a memory and you can store a variable number, to store a number press the ’M+’ key,
you can store a simple number or an answer from a calculation. The memory also has a running total, so
you can add and deduct numbers using the M+ and M- keys. To see the number stored in the memory or
the running total press the MRC key once. To clear the memory and reset back to zero press MRC key
Example1 – Store the answers to the simple sums 2+2 and 3+3 in the memory and calculate the total.
[Input 2, +, 2, M+, 3, +, 3, M+] now press the MRC key once, the correct answer of 10 will be displayed.
Example 2 – Use the memory to add these number together 5, -6, 8,9,-4.
[Input 5, M+, -6, M+, 8, M+, 9, M+, -4, M+] – now press MRC once and the correct answer 12 will be
displayed. To clear and reset your memory press the MRC key twice. Whenever a number is stored in the
memory an ‘M’ will show on the display.