English version

simple interest

From Longman Dictionary of Contemporary English
Related topics: Loans
simple interestˌsimple ˈinterest noun [uncountable]  BFLinterest that is calculated on the sum of money that you first invested, and does not include the interest it has already earned compound interest
Examples from the Corpus
simple interestShe argued that BofA underpaid because it used only simple interest in refunding the overcharged fees.
From Longman Business Dictionarysimple interestˌsimple ˈinterest [uncountable]FINANCE interest calculated only on the PRINCIPAL (=the original amount invested), not on any accrued interestI charged him 5% simple interest on the principal per week. interest
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