1.Kimmy has deposited ten year's red pocket money into a bank account.The
simple interest rate is 3% p.a. If the amount will be $ 19620 three years later
, find how much red pocket money she has deposited.
2.Ian has deposited $ 3800 in to the bank and the interest is compounded
half-yearly . If the interest earned after one year's deposite is $ 389.5,find the
compound interest rate per annum.
英文p6 to f1
2008-08-20 6:58 am
回答 (1)
2008-08-21 10:28 am
✔ 最佳答案
1) 18000((x * 0.03) * 3 ) + x = 19620
1.09x = 19620
x = 19620 / 1.09 = 18000
2) 5%
3800 * x * x = 3800 * x^2 = 3800 + 389.5 = 4189.5
x^2 = 4189.5 / 3800 = 1.1025
x = Sqareroot(1.1025) = 1.05
1.05 - 1 = 5%
參考: Myself
收錄日期: 2021-04-13 15:58:33
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