13. A shopkeeper bought 20 dozen eggs for $200. If 4 dozen eggs were broken and he sold the remaining eggs at $15 per dozen, what was the overall profit per cent?
15. Mr. Chan buys 10 dozen pens at a price of $480. Later on he sells the pens at $3.5 each. Find his lost % after he sells all the pens.
20. If Mike sells his television set at $2 700. he will lost $300 Suppose he wants to make a profit of $20%, how much should he sell the television set?
21. If a machine is sold at $7 760, then the loss per cent is 3%
(a) What is the loss per cent if the machine is sold at $7 440?
(b) What is the selling price if the machine is sold at a prifit of 10 %
幚我做幾條數(20分)
2008-11-26 4:12 am
回答 (2)
2008-11-26 5:36 am
✔ 最佳答案
13.Cost
= $200
Selling price
= $15 x (20 - 4)
= $15 x 16
= $240
Overall profit per cent
= [$(240 - 200)/$200] x 100%
= (40/200) x 100%
= 20%
=====
15.
Cost
= $480
Selling price
= $3.5 x (10 x 12)
= $420
Lost %
= [$(480 - 420)/$480] x 100%
= (60/480) x 100%
= 12.5%
=====
20.
Cost
= $(2700 + 300)
= $3000
To make a profit of 20%, selling price
= $3000 x (1 + 20%)
= $3600
=====
21.(a)
Cost
= $7760/(1 - 3%)
= $8000
Selling price
= $7440
Loss per cent
= $(8000 - 7440)/$8000
= 7%
(b)
Selling price
= $8000(1 + 10%)
= $8800
=
2008-11-26 4:22 am
13.
15(20-4) - 10(20)＊100%
10(20)
=20%
2008-11-25 20:27:39 補充：
15.
480-3.5(12)(10)
-------------------×100%
480
60
=------×100%
480
=12.5%
2008-11-25 20:31:27 補充：
20.
(300+2700)(1+20%)
=3000(120%)
=3600
2008-11-25 20:39:13 補充：
21題唔係太明佢想問乜...sorry=-=
15(20-4) - 10(20)＊100%
10(20)
=20%
2008-11-25 20:27:39 補充：
15.
480-3.5(12)(10)
-------------------×100%
480
60
=------×100%
480
=12.5%
2008-11-25 20:31:27 補充：
20.
(300+2700)(1+20%)
=3000(120%)
=3600
2008-11-25 20:39:13 補充：
21題唔係太明佢想問乜...sorry=-=
收錄日期: 2021-04-24 09:52:26
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