I really wish I could get sage math with a jupyter notebook on my phone. Does something like this exist.

just for basic math like

myburger = 10.75
mysoda = 3.75
(myburger + mysoda)*0.20

for calculating a tip.

I dunno, its way overkill but it is just so easy and clear to do simple math like this.

I guess I could do it in a spreadsheet app, idk