@@@@@【注意】@@@@@帮我做一下这10到数学题很简单的,可是我懒得做..

@@@@@【注意】@@@@@帮我做一下这10到数学题很简单的,可是我懒得做..
1.A printer printed 1000 books at a cost of $10 each.The selling price was fixed so that if he sold 800 copies he would make a profit of 24% on his total cost.The selling price per book is
A.$9.50
B.$16.50
C.$15
D.$16
E.$15.50
2.A shopkeeper raises the prices of his goods by 20%.Then he starts the annual sales by offering the customers a discount of 20%.What percentage discount do the customers actually get?
A.20%
B.The customers get no discount.
C.6%
D.4%
E.The customers pay 4% more.
3.At a restaurant,the bill for 5 sandwiches,9 cups of coffee and 3 plates of fried rice totalled $31.50 and the bill for 7 sandwiches,13 cups of coffee and 4 plates of fried rice totalled $42.00.The cost of an order consisting of one sandwich,one cup of coffee and one plate of fried rice at the same restaurant will come to
A.$9.50
B.$17
C.$10.50
D.$16.50
E.$12
4.A man pays $25 per month for the first 100 telephone calls and 15cents per call after the first 100 calls.If he makes 480 calls in a month,his telephone bill is
A.$72
B.$82
C.$62
D.$97
E.$120
5.If John sells an article for $336,he makes 40% profit.If he sells the article for $300 instead,what is his percentage profit?
A.10%
B.25%
C.15%
D.35%
E.40%
6.Mr Chow spent 1/5 of his salary on clothes and 3/20 of it on food.He then spent 40% of the reminer of his salary on rent.What percentage of his salary did he spend altogether?
A.26%
B.25%
C.39%
D.61%
E.49%
7.In producing an article,the materials cost 48% of total costs whereas wages form 52%.If the cost of materials decreases by 5% and wages increases by 15%,then the percentage increase in the total cost is
A.20
B.5.4
C.4.4
D.3.4
E.10
8.A shopkeeper makes a profit of 60% by selling an article at the marked price.If he gives a discount of 5% to a customer who pays cash,how much does the shopkeeper make on the transaction?
A.$46
B.$54
C.$56
D.$48
E.$52
9.The daily wage of a technician and an apprentice are in the ratio 2:1.In a day,a technician has to work 8 hours but an apprentice only 6 hours.The hourly wages of a technician and an apprentice are in the ratio
A.4:3
B.2:1
C.3:2
D.1:1
E.8:3
10.Peter sold a camera for $420 at a loss of 30% on the cost price.Find the corresponding percentage loss or gain if he had sold it for $594.
A.A loss of 1%
B.A loss of 12%
C.A gain of 10%
D.No loss or gain
E.A gain of 1%