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qid 209 · business

Question: Calculate the interest rate (between 0 and 1) for an account that started with $5,000 and now has $13,000 and has been compounded annually for the past 12 years. Answer with the numeric value.

  1. 0.0695
  2. 0.0587
  3. 0.0871
  4. 0.0500
  5. 0.0654
  6. 0.0828
  7. 0.0999
  8. 0.1100
  9. 0.0756
  10. 0.0932

Our answer: F. 0.0828 Source quote machine-checked (exact quote)

A machine check confirms the quoted words appear at the source. A person has not yet reviewed these. EARN MARKS as a Human Reviewer

How it was answered

Stored formula / worked method, replayed by code

Annual compound growth rate derivation problem

card: formula · card sha256 0f124d500c32cf7a…

Current source

Wikipedia, Compound interest

https://en.wikipedia.org/wiki/Compound_interest

“r is the nominal annual interest rate n is the compounding frequency (1: annually, 12: monthly, 52: weekly, 365: daily)”

Source quote machine-checked (exact quote)

retrieved 2026-09-18T00:09:51.224Z

page text sha256 cf7e8de7ae4d0a92… · content sha256 b89d5857659d2257…

addendum formula_qid209.formula_ADDENDUM_source_rs20260918T000951Z · sha256 37e6ba20c3b98db7… · replaces the version below, addendum sha256 835a15fd8e4d2d42…

Earlier version (superseded)

https://openstax.org/books/college-algebra-2e/pages/6-1-exponential-functions

Source weak (http_get_200_text_and_question_terms)

retrieved 2026-09-17T00:31:30.763Z

page text sha256 355a83042c6091a6… · content sha256 —

addendum formula_qid209.formula_ADDENDUM_source_relabel_unverified20260917T012453Z · sha256 835a15fd8e4d2d42… · replaces the version below, addendum sha256 8fda7ce834962fce…

Earlier version (superseded)

https://openstax.org/books/college-algebra-2e/pages/6-1-exponential-functions

Source weak (http_get_200_text_and_question_terms)

retrieved 2026-09-17T00:31:30.763Z

page text sha256 355a83042c6091a6… · content sha256 —

addendum formula_qid209.formula_ADDENDUM_source_bf20260917T003130Z · sha256 8fda7ce834962fce… · replaces the version below, addendum sha256 09b2447fae6ab6fa…

Earlier version (superseded)

No public source has been found for this card yet (5 places checked internally).

addendum formula_qid209.formula_ADDENDUM_source · sha256 09b2447fae6ab6fa…

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