中一一條數only!
2007-11-21 4:58 am
1.jacky plans to buy a pair of shoes.Two weeks ago,he saved 40%of the selling 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.
回答 (3)
2007-11-21 5:18 am
✔ 最佳答案
Put X be the original selling price of the shoes0.8X+12=0.9X
(0.8X=last week jacky saved money
0.9X=now the selling price of the shoes)
12=0.1X
X=12/0.1
X=120
so that the original selling price of the shoes is $120.
中一數都幾難wo!仲要用英文教.
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參考: 自己
2007-11-21 5:22 am
Let x be the original selling price of the shoes,
(1-10%)x = (40%)x+(60%)(80%)x+12
0.9x=0.4x+0.48x+12
0.02x=12
x=600
Therefore, the original selling price of the shoes is $600.
(1-10%)x = (40%)x+(60%)(80%)x+12
0.9x=0.4x+0.48x+12
0.02x=12
x=600
Therefore, the original selling price of the shoes is $600.
2007-11-21 5:14 am
Let ($)x be the original price.
40% x +60% x (80%) +12 = 90%x
12 = 2%x
x = ($)600
p.s. not sure correct or not!
F.1 homework do yourself la = = ....
40% x +60% x (80%) +12 = 90%x
12 = 2%x
x = ($)600
p.s. not sure correct or not!
F.1 homework do yourself la = = ....
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