Each solver is a sentence with blanks: X% of Y, X is what percent of Y, the percent change from X to Y (named as increase or decrease), and Y after an X% increase or decrease — the discount and tax cases in the notes. Results update live, display with your locale's number formatting and sensible rounding, and copy at full precision. Inputs accept your locale's decimal separator.
Privacy ledger
Data acquired
None.
Libraries used
Lit 3 — bundled into the tool file itself.
Data stored
None.
Data transmitted
None.
Use it on your own page
Download the tool as a single self-contained HTML file: readable source with the Lit library included, zero network requests — it works opened straight from your disk, and you can customize everything.