1,Mr Lam bought 30 mobile phones at $1600.He then sold 16 mobile phones for $1750 and 14 mobile phones for $1400.How much did he gain or loss ?
2,There are 400 animals in a zoo,in which 180 of them are birds.What percentage of birds is therein the zoo ?
3,If 50 tennis rackets are sold for $20000,the profit per cent is 25%.Find the cost price of each tennis racket.
4,If 25% of a number is 175,find the number.
HeLp!!~Thx}}'/
Maths (急) thx
2008-01-04 3:20 am
回答 (2)
2008-01-04 3:27 am
✔ 最佳答案
1.16x1750+14x1400-30x1600=28000+19600-48000
= -400
2.(180/400)x100%
=45%
3.(20000/50)/(1+25%)
=400/125%
=320
4.175/25%
=175x4
=700
2008-01-04 3:31 am
1)
Net feedback = 16*1750 + 14*1400 - 30*1600 = -400
So, he lost $400
2)
% = (180/400)*100%=45%
3)
Let $N be the cost price of each tennis racket
N*(1+25%)*50=20000
N*1.25*50=20000
N=320
So, the cost price of each tennis racket is $320
4)
Let X be the required number
X*25%=175
X*0.25=175
X=175/0.25=700
Net feedback = 16*1750 + 14*1400 - 30*1600 = -400
So, he lost $400
2)
% = (180/400)*100%=45%
3)
Let $N be the cost price of each tennis racket
N*(1+25%)*50=20000
N*1.25*50=20000
N=320
So, the cost price of each tennis racket is $320
4)
Let X be the required number
X*25%=175
X*0.25=175
X=175/0.25=700
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