interest rate f.3

👨🏻‍🏫 學術台數學

[匿名]

2011-06-11 11:30 pm

Sam deposited $2500 for 2 years, and the simple interest he got is $60, find the interest rate.

is it: 2500X2Xr = 60
or
2500X2Xr%=60

兩個有咩分別? 如果佢吾係叫你find interest rate, 叫你find the value of r 感應該係用邊條formula?

更新1:

hello : 係咪interest rate =1.2% , value of r= 1.2????

回答 (3)

hello

2011-06-12 4:01 am

✔ 最佳答案

http://www.webpagescreenshot.info/img/76639-611201125920pm.png
圖片參考：http://www.webpagescreenshot.info/img/76639-611201125920pm.png

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Godfrey

2011-06-13 4:28 pm

r = interest rate in decimal form
r% = interest rate in percent

In your example, r = 0.012, r% = 1.2%
In practice, interest rate is always quoted in percent. When we do the calculation, we use the decimal form. r = r%/100
Interest = principal x interest rate x term
$60 = $2500 x 0.012 * 2

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Sze

2011-06-12 12:14 am

其實2個一樣
只不過2500X2Xr = 60冇X返100%姐
如果佢叫你find interest rate 就要加% 你記住有RATE既要加%
叫你搵VALUE OF R既係要你比個數值佢唔洗加%
姐係依條: 2500X2Xr = 60

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