Patent ID: 7415492

Claim:
A tips calculator, comprising: a base member having a face side, wherein the face side has at least one display screen having a main display area and a share display area; a plurality of groupings of buttons, wherein: a first grouping of buttons includes buttons designating whole numbers from 0 to 9 and buttons designating at least mathematical functions of a decimal point, addition, subtraction, multiplication, division, and sum total, as well as an on button for turning on of the tips calculator and an off button for turning off the tips calculator, and a clear button for clearing of the main display area, whereby the first grouping of buttons is used to at least enter a bill amount, wherein the bill amount is displayed on the main display area; a second grouping of buttons includes buttons designating tip amounts as percentages of the bill amount in one percent increments and in a range from 10 percent to at least 25 percent, and includes a button for a total amount, whereby buttons designating tip amounts are used to enter a choice of a tip amount as a percentage of the bill amount with subsequent display of the tip amount on the main display area, and whereby the button for the total amount is used to obtain a total amount, which is a sum of the bill amount and the tip amount, wherein the total amount is displayed on the main display area; a third grouping of buttons includes buttons designating numbers of members in a group as whole sequential numbers from 2 up to at least 12, whereby buttons designating numbers of members in a group are used to select a number of members in a group and to obtain a display on the main display area of an individual share, wherein the individual share is a product of a division of the total amount by the number of members in a group and, furthermore, the third grouping of buttons additionally includes a share button for a display in the share display area of the individual share during performance of consecutive calculations on the tips calculator; means for performing functions and calculations designated by buttons in the plurality of groupings of buttons; and means for display on the display screen of values, functions, and results of calculations designated by buttons in the plurality of groupings of buttons.