One day, I went to get food with some friends and I put my card down to pay. There were multiple items and each item was split between a different subset of people, so I realized that figuring out how much each person owed was quite a tedious process. To solve this problem, I decided to automate this process in an easy (at least to me) way. This is Splitty!

How many items were there?

Note that for the purpose of calculating each person's share of the tax, tip, and other fees, Splitty uses a "proportional split". For example, let's say Tom ordered hot wings that cost $8, and Jerry ordered a side dish that cost $2. This makes the subtotal $10. Now let's say the tax, tip, and additional fees were an extra $10. This makes the total $20. In my opinion, it doesn't seem fair for Jerry to have to pay half of the additional fees when they only got a side! Others may agree :) Instead, they should be charged for the proportion of items that they bought. If you fed this bill into Splitty, it would report that Tom owes $16 and that Jerry owes $4.