How to use
The user selects and inputs the following:
1.  A currency (i.e. GBP)
2.  BOH on screen 1 or FOH on screen 2
3.  Number of operating days per week
4.  An amount into sales/revenue
5.  An amount into food cost (as a digit or %)
6.  An amount into wages/labour (as a digit or %)
7.  An amount in overheads (as a digit or %)

Once the user has inputted numbers/digits into the BOH on screen 1, the user can toggle to the FOH on screen 2 and repeat the process. After completing both screens 1 and 2, screen 3 provides a Food & Beverage summary.