1) John deposits $40000 in a bank at R% p.a. simple interest for 5 years. If he receive $47000 at the end of the period, find the value of R.
2) Susan deposits $8000 in a bank for 9 mouths. The bank pays simple interest at a certain interest rate per year. If Susan will get the amount of $8240 at the end of the period, what is the interest rate per year?
英數!!!急!!!(上)
2007-05-15 1:46 am
回答 (1)
2007-05-15 1:59 am
✔ 最佳答案
1) John gets $7000 ($47,000 - $40,000) as interest at the end of the period.40000 x R% x 5 = 7000
200000 x R% = 7000
R% = 7000 / 200000 = 3.5%
=> R=3.5
2) Susan gets $240 (8240-8000) as interest at the end of the 9-month period.
8000 x R x 9/12 = 240
6000 x R = 240
R = 240 / 6000 = 1/25 = 4%
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