simple MATHS homework...

如題中有些要用x的,
都不用打let x be...了
有''式''和''答案''就可以了
請全都解答,,有20分和好評
1.)Mr Cheung sold a van for $8400 and sells it for $7350.Find the
perecentage loss.
2.)A shop owner sold a book for $599 and made a profit of $99.Find the
perecentage profit.
3.)The cost of10 dozens of eggs is $60.If half of the eggs are sold at a profit
of 50%,and the rest are sold at a profit of 30%, find the profit for selling
all the eggs.
4.)Brain sold a pair of sport shoes at a profit of35%. It is known that he
gained $350. How much did he buy the sport shoes for?
5.)A car is sold for $120000 at a profit of 25%.Find the cost of the car.
6.)A modle ship is sold for $225 at a loss of 25%.How much does it cost?
7.)A hotle provides a special offer for buffect dinner.For every 5 persons
who enjoy the buffet dinner,one of them will get it free.Find the
perecentage discount.
8.)Mrs Ma buys a coat withe a marked price of $1250 at 60% off.
a.----Find the selling price of the coat.
b.----If Mrs Lee gets an extra discount of $100 for the same coat, find the
perecentage discount for Mrs Lee .
9.)A portable game machine is sold for $360. The perecentage loss is 20%
a.----Find its cost.
b.----If the game machine is sold for$369, find the perecentage loss.
10.)The cost of manufacturing a chair is $20. The chair is sold to a retailer
at a profit of25%. The retailer then sells the chairs for $14 each.
a.----Find the cost of each chair for the retailer.
b.----Does the retailer make any loss? Find the perecentage profit or loss.
11.)Mark and matthew each buys 16000 shares for $4.5per share.
a.----Mark sells 10000 shares for $4 each and the rest for $5.5 each.
Excluding other charges, does he make a profit or a loss?
b.----Matthew sells 10000 shares for $4.2 each and the rest for $5.3 each.
Excluding other changes, does he make a profit or a loss?
c.----Who do you think is better in investmernt?Explain briefly and find the
overall perecentage profit of that person.
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