Maths~Percentage2

2008-08-04 10:36 pm

1)If the value of a car depreciates at the rate of 15% per year,find the percentage decrease in the value of the car after 3 years.

2)Mrs.Wong bought a flat in 2000 for $3000 000 and sold it to Mr. Chan at loss of 40% in 2002.

(i)Find the amount that Mr. Chan paid for the flat.
(ii)Find Mr.Chan's profit/loss per cent if he sold the flat in 2003 for $1980 000.

3)A carpenter sold two tables A and B . He made a 60% profit on selling table A, and the profit per cent he made on selling the two tables was 50%. It is given that the cost price of table A is 20%higher than that of table B

(i)Find the profit per cent on selling table B.
(ii)If the selling price of table B is $2760,find the carpenter's total profit on selling both tables.

更新1:

Questions ANSWER! 1)38.6% 2)(i)$1800 000 (ii)profit per cent=10% 3)(i)38% (ii)$2200 I WANT THE STEPS! THANKS~

回答 (1)

[匿名]

2008-08-09 12:51 am

✔ 最佳答案

1) 1-(1-0.15)^3 = 38.6%

2)(i) 3 000 000 x (1-0.4) = 1 800 000
(ii) (1 980 000 - 1 800 000) / 1800000 x 100% = 10%

(3)(i)
Let A be the price of table A
Let B be the price of table B
Let x be the profit per cent on selling table B

1.6A (60% profit on selling table A)
(1+x) B (x% profit on selling table B)
1.5 (A+B) (50% profit on selling table A and B)
A/B = 1.2 (cost price of table A is 20%higher than that of table B)

Try to solve it youself:
1.5(A+B) = 1.6A + (1+x)B

Finalize, sub. A/B = 1.2 into the formula
and you will get x = 38%

(ii)
B = 2760/(1+0.38) = 2000
sub. B=2000 into A/B=1.2
A = 2400
the profit is 50%, so it is 0.5(2400+2000) = 2200

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