For other people like me whose brains hurt doing arithmetic, I made this lookup table to calculate how much to tip. The requirements for the lookup table are:
- Minimize the number of things to remember
- Tips must be integral
- Tip should be in the 15%-20% range
Amount..Tip
0-5.......1
5-8.......1
8-10....1.5
10-14.....2
14-20.....3
20-25.....4
25-30.....5
30-40.....6
40-50.....8
50-60....10
A generative model of this table is more useful for folks (like me) whose memory is worse than their arithmetic. By example
50 -> 5 -> 10
40 -> 4 -> 8
30 -> 3 -> 6
25 -> 2.5 -> 5
14 -> 1.4 -> 2.8 -> 3
8 -> 0.8 -> 1.6 -> 1.5
The tip amount is an approximate, I'll usually just round up the total (bill + tip) amount to the next whole number. So calculating the tip at <=0.1 precision isn't required
I used to do this exact calculation before. Was very taxing for my low-power ALUs 😂.