F.3 MATHS
2014-07-09 6:45 pm
1.The price of a digital camera was decreased by 10 % each month forthree months. If the price of a digital camera was $3000 three months ago, whatis the price of it now?2.The value of a machine is $50000. Itsvalue depreciates by 15% each year in the first two years and 20% in eachsubsequent year. Find the value of it after four years.
回答 (1)
2014-07-09 7:49 pm
✔ 最佳答案
1.
new price = old price x (1 - 10%)^3
new price = 3000 x (1 - 10%)^3
new price = $2187
2.
the value
= 50000 x (1 - 15%)^2 x (1 - 20%)^2
= $23120
參考: knowledge
收錄日期: 2021-04-28 14:41:19
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https://hk.answers.yahoo.com/question/index?qid=20140709000051KK00035