[COST] [MARGIN] [SELL] :Used for calculating the cost,
  | selling price and profit margin  | 
  | amount. Enter the value of any 2  | 
  | items to obtain the balance value  | 
  | item. (e.g. enter the value of the  | 
  | cost and the selling price to obtain  | 
  | the profit margin.)  | 
[GT]  | :In Grand total mode, adds the  | 
  | total register to the  | 
  | GT register by the (*/T) key  | 
[TIME]  | :Displays date or time  | 
[SET]  | :Used to set the date and time in  | 
  | calendar & clock mode  | 
[AM/PM] | :Used to switch between AM or PM  | 
  | at clock mode time setting  | 
[12/24]  | :Used to switch between 12 or 24  | 
  | hour at clock mode time setting  | 
[FORMAT]  | :Used to select date format  | 
  | between “YYYY/MM/DD”,  | 
  | “DD/MM/YYYY” or  | 
  | “MM/DD/YYYY” at calendar mode  | 
DISPLAY SYMBOL | 
  | 
MEMORY  | :A number has been stored  | 
ERROR  | Memory  | 
: Error overflow of capacity  | |
-  | : The display value is negative  | 
GT  | : A number has value is negative  | 
TAX+,  | : Performance of tax calculation  | 
: Performance of cost, sell, and  | 
SEEL,COST,MARGIN% Profit margin calculation
DATE AND TIME FUNCTION
The TIME/ DATE key is used to display the Time or Date.
Depressing the TIME/DATE key once displays the 
Depressing the TIME/DATE key a second time displays the time , 
When displaying the Date or Time the = key