Maths question (2)

2012-08-25 8:29 pm

1. The scale of a map is 1cm to 200 m ( 1: 20000 )
What is the length of a highway on the map if its actual lenth is 8 km?

2. A man put $10 into a bank at the begining of 1900 at a compound interest of 8% per annum, compounded annually. How much can he get back at the end of 2003? (Correct the answer to nearest cent)

回答 (1)

PeterChow

2012-08-25 9:10 pm

✔ 最佳答案

1. The scale of a map is 1cm to 200 m ( 1: 20000 )
What is the length of a highway on the map if its actual lenth is 8 km?
1cm to 200m = 1cm to 0.2km
1cm:0.2km=length on the map:8km
1/0.2=length on the map/8
5=length on the map/8
length on the map=40cm

2. A man put $10 into a bank at the begining of 1900 at a compound interest of 8% per annum, compounded annually. How much can he get back at the end of 2003? (Correct the answer to nearest cent)
Amount
=10x(1+8%)^(2003-1900)
=$27710(corr.to nearest dollar)

參考: me

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