请帮忙解释以下会计原理：purchase cost :$3500,terms 2/10

题目

请帮忙解释以下会计原理：purchase cost :$3500,terms 2/10
purchase cost :$3500,terms 2/10
If the company passed up the discount,it would have paid 2 percent for the use of $3500 for 20 days.This equals an annual interest rate of 36.5%( 2% × 365 / 20).Obviously,it would be better for the company to borrow at bank interest rates than to lose the purchase discount.
1.不明白这里的interest rate 是什么?是银行的固定利率吗?括弧里面的公式怎么理解?
2.为什么跟银行借钱更好?

答案

利息率,20天的折扣期过了,损失2%,相当于日利息2%/20,换算成年利率,再乘以365
因为年利率相当于36.5%,比银行利率高多了,当然借款划算了,他的意思是丧失折扣的成本很高,不要轻易放弃