Please use the method of equation!!
1.When will a sum of money double itself if simple interest is calculated at an interest rate of 5% p.a?
2.Susan deposits$7000 in a bank for 10 months.THe bank pays simple interest
at a certain interest rate per year.If Susan will get the amount of $7350at the end of the period,what is the interest rate per year?
3.Shirley deposits%6000 in a bank of interest rate of R% p.a.If the interest changes to5.5%p.a she will get$180 more,two years later.Find the value of R
4.Find the principal that will amount to $13156 after 73 days if wimple interest is calculated at an interest rate of 6% p.a.
F.1 problems about simple interest
2008-05-06 11:14 pm
回答 (2)
2008-05-06 11:55 pm
✔ 最佳答案
1.) the formula is: x*(1 5%)^n=2x [x is the money][del. x because x is not equate 0] then will to be: (1.05)^n=2
[charge to be the Log mode] then will to be: (log1.05)/(log2)=n
[please answer it by yourself with the calculator]
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2.)the formula is : 7000*(1 x%)^10=7350 [x is the interest rate]
so then will to be:(1 x%)^10=7350/7000
then will to be:(1 x%)^10=1.05
[please answer it by yourself with the calculator]
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3.)the formula is : 6000*(1 R%)^2 180=6000*(1 5.5%)^2
[explain:Shirley will get $180more if the interest rate is 5.5% then the interest rate is R%. so (the money which the interest rate is R% $180 )are equate to the money which the interest rate is 5.5%]
[please answer it by yourself with the calculator]
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4.)73days=2 months 12 or 11 or 10.....
so the formula will be: x*(1 6%)^2=13156
[please answer it by yourself with the calculator]
2008-12-06 7:10 am
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收錄日期: 2021-04-13 15:31:29
原文連結 [永久失效]:
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