#1621 · Algebra · Exponentials & logarithms

Simple interest and discount

At simple interest the interest on a certain sum of money is £90, and the discount on the same sum for the same time and at the same rate is £80; find the sum.

~8 minAnswer checked instantlysimple interestdiscount

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XVIII. Interest and Annuities, Examples XVIII.a, No. 2

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).