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Simple interest

単利 ／ simple-interest　—　Measuring

A calculation where interest accrues only on the principal. Principal × (1 + annual interest rate × number of years).

France — Louis XVI and the reformers / A banker's office in Paris
A scene for the related term “Compound Interest” — France　Louis XVI and the reformers ／ A banker's office in Paris

The difference from compound interest is whether interest accrues on the interest. The difference is small over short periods and large over long periods.