#1625 · Algebra · Exponentials & logarithms
Discount as harmonic mean
Shew that at simple interest the discount is half the harmonic mean between the sum due and the interest on it.
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XVIII. Interest and Annuities, Examples XVIII.a, No. 6
Stuck? A gentle nudge
Your working
Check your full solution
Attach photos of your pages (up to 3) or one PDF — or check what you typed above. Lemma reads the work and verifies the reasoning, not just the answer.
Your first check today doesn't need an account.
Your photos and PDFs are read once and not stored — only the transcription is kept.