What percentage gets us back?Year 11 Inquiry · T1 W5–6 · Interactive activity

This original offline tool tests invented amounts only. A first percentage changes the base. Predict the reverse percentage before running the model. No prices, user input or results leave this page or enter storage. The full paper and tactile route needs no device.

Set a what-if model

Write or say your prediction. The return uses the new amount as its base.

No case has been run yet.

Two complete paper examples

On a narrow screen, scroll the table sideways. Both complete examples are also in the paper route above.

OriginalFirst stepNew amountCorrect returnRepeat first % instead
$9625% rise = +$24$12020% fall = −$24 → $9625% fall → $90
$6020% fall = −$12$4825% rise = +$12 → $6020% rise → $57.60

The same dollar gap sits over a different denominator on the way back. These figures are invented; the table is not a real price history.

Original SubjectNest tool © NeuroForgeIO Pty Ltd 2026, CC BY 4.0. Inline code is Apache-2.0. No account, analytics, network request, local storage or personal data.