<40 m> F.2 百分率 (2)

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2009-07-16 3:07 am

各位知識朋友 , 入黎幫下手呀!!!
我有數學問題唔識 , 幫手解答呀( 數學F.2 )!!!!!!!!!!!!!!! (要步驟)

1. The population of a town , at the beginning of 1994 is 2 500 000. If the population increases by 1.8% each year , what will the population be at the beginning of 1998 ( correct to the nearest hundred) ?

2. The value of a car decreases each year by 15% of its value at the beginning of the yera. If the car originally cost $98 000 , what will be its cost six years later? ( Give the answer correct to the nearest hundred dollars.)

3. Determine the annual simple interest rate at which $8 500 grows to $10 200 in 4 years.

回答 (1)

用戶7639

2009-07-16 3:46 am

✔ 最佳答案

the population be at the beginning of 1998
=2 500 000x(1+1.8%)4
=$3401200

its cost six years later
=98 000x(1-15%)6
=$37000

3.Let the annual simple interest rate be r%.
8500+8500x(r%)(4)=10200
8500x(r%)(4)=1700
4(r%)=0.2
r%=0.05
r=5
∴The annual simple interest rate be 5%.

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