#1638 · Algebra · Sequences & series
Annuity Purchase Rate
If 25 years' purchase must be paid for an annuity to continue years, and 30 years' purchase for an annuity to continue years, find the rate per cent.
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XVIII. Interest and Annuities, Examples XVIII.b, No. 10
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).