<40 m> F.2 百分率 (4)
2009-07-17 3:09 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. A certain kind of bacteria grow at a rate of 60% every 10 minutes. If there are 250 bacteria initially, find the numer of bacteria after 1 hour correct to the nearest integar.
2. A photocopier is bought for $15 000 and its value depreciates by 16% in the first year and 9.5% in each subsequent year. Find its value at the end of the third year (correct to the nearest dollar).
3. John borrows $30 000 from the bank at 9% p.a. , compounded quarterly. He repays $8 000 at every 3 months. How much does he still owe the bank just after half a year?
回答 (2)
2009-07-17 3:27 am
✔ 最佳答案
1.The numer of bacteria after 1 hour =250x(1+60%)6
=400
2.Its value at the end of the third year
=15 000x(1-16%)x(1-9.5%)2
=$10320
3. he still owe the bank just after half a year
=[30 000x(1+(9/4%)-8000] x(1+9/4%)
=$23185(correct to the nearest dollar).
2009-07-17 4:03 am
(1.)
900
(2.)
???
(3.)
($30000x9%)+30000
30000+2700
30000+2700
38100-8000
redo onec
=30200
900
(2.)
???
(3.)
($30000x9%)+30000
30000+2700
30000+2700
38100-8000
redo onec
=30200
參考: me
收錄日期: 2021-04-23 20:37:32
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https://hk.answers.yahoo.com/question/index?qid=20090716000051KK01691