1. Merry borrows a sum of money from a bank at 6.25%p.a. Find the sum of money that Merry borrows if she has to pay $2,812.5 as interest after 1.5 years.
2. Merry deposits $7,000 in a bank for 10 months. The bank pays simple interest at a certain interest rate
per year. If Merry will get the amount$7,350 at the end of the period, what is the interest rate per year?
Please show steps
Simple interest questions
2007-11-02 6:26 am
回答 (2)
2007-11-02 6:33 am
✔ 最佳答案
1. Let $y be sum of money,y* 6.25%* 1.5 = 2812.5
0.09375y = 2812.5
y = 30000
∴ The sum of money is $30000.
2. Let x% be the interest rate per year,
7000* x% * 10/12 + 7000 = 7350
7000* x% * 10/12 = 350
x = 0.06
∴The interest rate is 6% per year.
參考: =]
2007-11-02 6:35 am
Under simple interest concept,
1. $2,812.5 / 1.5 / 0.0625
principle is $30,000
2. (7,350 - 7,000) / 10 * 12 /100 = 4.2% per year
1. $2,812.5 / 1.5 / 0.0625
principle is $30,000
2. (7,350 - 7,000) / 10 * 12 /100 = 4.2% per year
收錄日期: 2021-04-13 14:17:45
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