1.Peter deposited $10000 in a blank in 1996 and $9000 in 1997. The interest was compounded yearly at X% p.a., and the total amount he received in 1998 was $22000. Find X.
Suppose the population of a town grows by 2% each year and its population at the end of 1996 was 300000. At the end of which year will the population just exceed 330000?
Thanks!
maths
2006-10-19 12:43 am
回答 (1)
2006-10-19 1:13 am
✔ 最佳答案
1.(10000(1+X%)+9000)(1+X%) = 220002. 300000(1+2%)^n =330000
^n = n次方~
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