.A handbag costs $400 .The marked price of the handbag is20%
above the cost. It is sold at a 25%discount on the marked price,
(a) Find the selling price of the handbag.
(b)Find the percentage profit or percentage loss.
5.The radius of a circle is 8cm.A new circle is formed by increasing
the radius by 10%
(a) Find the area of the new circle in terms ofπ
(b) Find the percentage increase in the area of the circle.
6.The price of a textbook was $80 last year. The price is increased
by 20% this year.
(a)Find the new price.
(b)Peter is given a 20% discount when buying the textbook from a
bookstore this year.How much does he pay for this book?
7.The marked price of a toy car is $29.It is sold at a discount of 20%
(a) Find the selling price of the toy car.
(b) If the cost of the toy car is$18,Find the percentage profit.
percentage and Interest
2009-01-28 4:20 am
回答 (2)
2009-01-28 4:31 am
✔ 最佳答案
4(a)The selling price of the handbag
=400*(1+20%)(1-25%)
=360
(b)
The percentage loss
=(360-400)/400*100%
=-10%
5(a)
The radius of new circle
=8*1.1
=8.8 cm
The area of the new circle
=π(8.8)^2
=77.44π cm^2
(b)
The percentage increase in the area of the circle
=(77.44-64)π/64π*100%
=21%
6(a)
The new price
=80*(1+20%)
=96
(b)
The money he paid
=96*(1-20%)
=76.8
7(a)
The selling price of the toy car
=29*(1-20%)
=23.2
(b)
The percentage profit
=(23.2-18)/18*100%
=28.89%
2009-01-28 4:52 am
The selling price of the handbag
400*(1+20%)(1-25%)
=360
The percentage loss
360-400)/400*100%
=-10%
The radius of new circle
8*1.1
=8.8 cm
The area of the new circle
π(8.8)^2
=77.44π cm^2
The percentage increase in the area of the circle
(77.44-64)π/64π*100%
=21%
The new price
80*(1+20%)
=96
The money he paid
96*(1-20%)
=76.8
7(a)
The selling price of the toy car
29*(1-20%)
=23.2
(b)
The percentage profit
=28.89%
400*(1+20%)(1-25%)
=360
The percentage loss
360-400)/400*100%
=-10%
The radius of new circle
8*1.1
=8.8 cm
The area of the new circle
π(8.8)^2
=77.44π cm^2
The percentage increase in the area of the circle
(77.44-64)π/64π*100%
=21%
The new price
80*(1+20%)
=96
The money he paid
96*(1-20%)
=76.8
7(a)
The selling price of the toy car
29*(1-20%)
=23.2
(b)
The percentage profit
=28.89%
收錄日期: 2021-04-13 16:23:43
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