What formula do you use for this equation?

👨🏻‍🏫 學術台數學

[匿名]

2008-06-29 3:29 pm

If a car is 12,590 $ on sale at 20% off what is the original price?

What type of formula do you use for that.

Thanks

更新1:

Can you please show what answer you got. I have the answer but I dont know how to reach that conclusion. Thanks

更新2:

********************************* Sorry guys , I need to know how to find the ^^Original Price^^.

更新3:

Thanks so much Thats it! You're all awesome. Esp Jun.

回答 (7)

[匿名]

2008-06-29 3:43 pm

✔ 最佳答案

x = original price

x * 80% = 12590
x = 12590 / .8
x = 15737.50

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[匿名]

2008-06-29 10:39 pm

= $12,590.00/(100% - 20%)
= $12,590.00/80%
= $12,590.00/0.8
= $15,737.50

Answer: $15,737.50

Proof:
= $15,737.50 - 20%($15,737.50)
= $15,737.50 - 0.2($15,737.50)
= $15,737.50 - $3,147.50
= $12,590.00

Original price (x):
x - 20%x = $12,590.00
x - 0.2x = $12,590.00
0.8x = $12,590.00
x = $12,590.00/0.8
x = $15,737.50

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An ESL Learner

2008-06-29 10:40 pm

$12590 Ã· (1 - 20%)
[new price Ã· (new price/original price)%]

$12590 Ã· (1 - 20%)
= $12590 Ã· 80%
= $12590 Ã· 80/100
= $12590 x 100/80
= $1259000/80
= $15737.5

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Como

2008-06-30 12:06 am

80%<------------>12,590
100%<---->(100/80) x 12,590 = 15,738

$15,738 to nearest whole number

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[匿名]

2008-06-29 10:36 pm

.8x = 12590

If you take 20% off the original price, you are paying for 80% of it. So .8(x) where x is the original price is how you find 80% of the original price which was 12590.

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[匿名]

2008-06-29 10:33 pm

12590/ 100 x 20 + 12590= 15108

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[匿名]

2008-06-29 10:33 pm

x - .2x = 12590

x is the original price
you have to subtract 20% so you have to multiply the original price by .2 to get the percentage.
1x - .2x = .8x
.8x = 12590
you now have to divide by .8 to get the answer.

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