#1624 · Algebra · Exponentials & logarithms
Time to grow to a target
In how many years will £1000 become £2500 at 10 per cent. compound interest?
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XVIII. Interest and Annuities, Examples XVIII.a, No. 5
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).