Abstract
Some problems on simple interest are solved graphically with the help of properties of similar triangles, and ratio and proportion. Each of the four variables: principal, interest or amount, rate of interest, and time, is computed by means of the other three. For each, a set of rectangular axes is chosen to start with. The data and the unknown variable are represented by the corresponding sides of two or more similar triangles. Finally, the educational merits and limitations of the method are discussed.
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