If a price is 90 cent after 40% discount, whats the original price ?

100%-40%=60%

90 cent is 60% of what number?

The trick is to find what the word means in math term. For instance, the word "is" mean equal and the word "of" means to multiply. The sign (*) means to multiply. You can write the equation as 0.90=(is) 0.60*(of) number. 0.90=0.60n

Let n stand for the original price. You would want the n to be alone. So you divide both sides by 0.60. For instance:

0.90=0.60n

0.90/0.60=0.60n/0.60

1.50=n

Therefore, the original price is $1.50.

Lastly, you can check to make sure it is correct.

0.90=0.60*1.50

0.90=0.90

Hopefully, that helps you.

Hooah!

You use n as the unknown of the value of her sales. You can write this equation as

0.02n=50

You would want the n to be alone. So you divide both sides by 0.02.

0.02n/0.02=50/0.02

n=2500

Therefore, the answer is $2500.

Lastly, you can check to make sure it is correct.

0.02(2500)=50

50=50

$50 is 2%  of what amount?

50   = 0.02 ×       x

50 = 0.02x

Divide both sides by 0.02 to isolate x

2500 = x <-- answer

CHECK

Is 50 really 2% of 2500?

10% of 2500 is 250

So 1% of 2500 must be 25

So 2% must be 50 ✔

Answer:

To earn $50 @ 2% of sales, the value of the sales was $2500.

You can check it by finding 2% of $2500 and seeing if it comes to $50

2% of $2500

0.02 × 2500

50 ✔

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The price minus 40% of the price equals 90¢

(This is the same as asking "What is 60% of the original price?)

p - 0.4p = 90

Combine like terms

0.6p = 90 <-- here you are finding 60% of the original price

Divide both sides by 0.6 to isolate p

p = 150

CHECK

Is 90¢ really 60% of $1.50?

10% of 150 = 15

So 60% must be 15*6 which is 90 ✔

Answer:

If the price is 90¢ after a 40% discount, the original price was $1.50

Problem 1: 50*.02 = $1

Problem 2: 90/4 = 22.5*10 = 225 cents= $2.25