商しょう業ぎょう算さん術じゅつ

noun

commercial arithmetic

Refers to arithmetic applied to commerce, such as calculating interest, discounts, profit margins, and currency exchange. A somewhat technical or academic term.

• 商しょう業ぎょう算さん術じゅつの授じゅ業ぎょうでは、利り息そくの計けい算さん方ほう法ほうを学まなんだ。

  In the commercial arithmetic class, we learned how to calculate interest.