Welcome to MooMooMath where we upload a new

Math video everyday. Today this video covers how to work discounted

prices and percents. Example problem: What is the discounted price

of a $55 shirt that has been marked down 15%?

You will often see this in stores for things on sale.

You can use the

discount formula: Original price-(original price times discount

in decimal form)=Discounted price Keep this in mind.

Here we go. Original price=55 – 55 times .15 equals

the discounted price. 55 x .15=8.25

Now 55 – 8.25=a discounted price of 46.75 Now there is a shortcut to this, if you like

you can just multiply 55 times .85 which equal 1-15=.85, and that will get you the same

answer. Sample problem two,

What is the discounted price of a $45 watch marked down 10%?

Take the original price minus the original price times the decimal form of the percent,

which is .10. and this equals the discounted price.

I know 45 x .10=4.50 Next we have 45 – 4.50 which equals 40.50

Again the shortcut method

is to take 1 – .10=.90 Next multiply .90 times 45 and it equals 40.50

The final problem is, “If the discounted price of a shirt that is marked down 20% is $30,

what was the original price? Again, use the discount formula: ” Original

price-(original price times discount in decimal form)=Discounted price”

Now just fill in what we are given. Original price is x, again the original price

is x times the discount which is 20%, and I will write it as a decimal.

For the decimal I just move two places to the left, and this will equal our discounted

price of $30 x times .20 equals .20x. I will put a 1 in

front of this x so you can see what I’m doing. Bring the 30 down.

Combine like terms 1x-.20x equals .80x Divide each side by .80.

Finally x equals 30 divided by .80, which equals 37.50

I can check this by multiplying by our shortcut and I can just multiply by .80 and it equals

the discounted price of $30 If you get your calculator out you can see

that 37.50 times .80 equals 30. So out original price equals $37.50

Hope this helps. MooMooMath uploads new Math video everyday.

## 8 comments

## Mariel Anne

hello, how do you find the total discount of an item when you are given an original discount with an additional discount?

## Pradeep Satpathy

thanks for this vedio its jelp me a lotπππ

## Smile at 2am

I see dat middle finger π

## Jeremiah Brown

Thx this help a little π

## Jeremiah Brown

Thx this helps a litttle =)

## jona jane

last one is wrong its 24

## Iris Valladares

Yeah still donβt get it

## Marissa Aninon

1:43 Middle finger