1.Jacky plans to buy a pair of shoes.Two weeks ago,he saved 40%of the sellig price of the shoes.Last week,he saved 80% of the rest.This week,the shoes are on sale at a 10%discount,but he still owes$12.Find the original selling price of the shoes.
2.A grocer bought 5000 oranges at $4000.he sold 4000 of them at$1.2 each.The rest were sold at a discount of 40% on the cost.
(a)Find the toatl amount of money he received.
(b)Find the profit percent.
中一數學,,,,,,,,
2007-12-14 1:28 am
回答 (2)
2007-12-15 7:43 pm
✔ 最佳答案
1)Let x be the original price of the shoesx[40%+(1-40%)80%]=x(1-10%)-$12
x(40%+48%)=x(90%)-$12
x(90%)-x(88%)=$12
x(2%)=$12
x=$12/2%
x=$600
2a)4000x$1.2+(5000-4000)x$1.2x(1-40%)
=4000x$1.2+1000x$1.2(60%)
=$4800+$720
=$5520
2b)[($5520-$4000)/$4000]%
=(1520/4000)$
=38%
2007-12-14 2:04 am
1)
original price : $x
he saved 1st time : 40%x
he saved 2nd time : 80% (x - 40%x)
discount at 10% : (1-10%)x
still owe : $12
Let the original price be $x.
(1-10%)x - 40%x - 80%(x-40%x) = 12
90%x - 40%x - 80%(60%x) = 12
90%x - 40%x - 48%x = 12
2%x = 12
x = 600
original price : $x
he saved 1st time : 40%x
he saved 2nd time : 80% (x - 40%x)
discount at 10% : (1-10%)x
still owe : $12
Let the original price be $x.
(1-10%)x - 40%x - 80%(x-40%x) = 12
90%x - 40%x - 80%(60%x) = 12
90%x - 40%x - 48%x = 12
2%x = 12
x = 600
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