標題:
幾題中三既數一問
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發問:
1)Sammul depoints $300000 in a bank C and receives a simple interest of $24000 in years.(a) Find the simple interest rate and the amount received.(b) The amount recieved is then despointed in another bank H at the same interest rate,but interest rate,but interest is compunded quartely.What will be... 顯示更多 1)Sammul depoints $300000 in a bank C and receives a simple interest of $24000 in years. (a) Find the simple interest rate and the amount received. (b) The amount recieved is then despointed in another bank H at the same interest rate,but interest rate,but interest is compunded quartely.What will be total amount recieved 2 more years later?(give the answer correct to the nearest dollar) 2)Timmt buys a hi-fi at $ 12000 in 2002 .It is estimated that its value will decrease to$9720 in two year's time. (a)Find the decay factor each year. (b)Find the value of the hi-fi in 2008. THANK YOU THANK YOU
最佳解答:
1)Sammul depoints $300000 in a bank C and receives a simple interest of $24000 in years. (a) Find the simple interest rate and the amount received. the simple interest rate = 24,000/300,000 *100% = 8% p.a. the amount received = 300,000+24,000 = $324,000 (b) The amount recieved is then despointed in another bank H at the same interest rate,but interest rate,but interest is compunded quartely.What will be total amount recieved 2 more years later?(give the answer correct to the nearest dollar) total amount recieved 2 more years later =(324,000)*(1+8%/4)^2*4 = $379,618 (correct to thee narest dollars) 2)Timmt buys a hi-fi at $ 12000 in 2002 .It is estimated that its value will decrease to$9720 in two years time. (a)Find the decay factor each year. Let x%p.a. be the decay factor each year, 12,000(1-x%)^2=9,720 (1-x%)^2=0.81 1-x%=0.9 x=10 the decay factor each year is 10%p.a. (b)Find the value of the hi-fi in 2008. the value of the hi-fi in 2008 = 9,720*(1-10%)^6 = $5,165.60652
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