Best A= 10 points♥ how do you multiply percents?

Question

The best answer that teaches me how 2 do it and they FULLY describes it gets the 10 points. For example, if I wanted to buy something, but I got a discount off:

Camera $198
40% off

What is the sale price?

And just to make sure i REALLY get it:

T-Shirts $12
25% off
What is THIS sale price?

Answer 1

A percent is simply a number over 100. For example 50% is simply 50 over 100 or 1/2. (Isn't 50% off half off?) It's much easier as a decimal. Whenever you're dealing with a percentage, move the decimal two places to the left. Thus 50% would be 50.0 moving to the left two spaces, 0.5 Remember 50 and 50.0 and 50.000000000 are all the same thing. When multiplying percents $198 at 40% off...Simply multiply 198 x .4 -- You'll get $79.20. The trick here is it says 40% off. So Now that you know what 40% of $198 is, you need to subtract it from $198. So $198 - $79.20 would mean the sale price is $118.80.

The way I would handle this problem is I would say to myself. If an item is 40% off, that means it costs 60% of what it normally does. So instead of multiplying by 40% then subtracting that answer from the regular price...I would subtract 40% from 100% and multiply that answer by my regular price. I think subtracting 40 from 100 is easier than subtracting 79.2 from 198. But it's up to you. Thus 60% (or 0.6) x $198 = $118.80

For your second example, we'd do the same thing. 25% off means the T-Shirt will cost (100%-25%) 75% of $12. 75% (.75) x 12 = $9. Hope that helps.

Answer 2

To multiply percents, you make it a fraction over 100 first (42% becomes 42/100, etc.) then multiply.

For the camera, 40% off of 198 is 198*40/100, or 79.2, so the discount is $79.20 (since it's 40% OFF), and the sale price is $118.80.

For the T-shirt, 25% off of 12 is 12*25/100, or 3, so the discount is $3 (since it's 25% OFF), and the sale price is $9.

Answer 3

40% = 40/100 = (drop the 0's) 4/10, (simplify) 2/5
198/1 = 2/5 198*2/5 = $79.20 (discount). Take 198 - 79.20 = $118.80 Sale price.


25% = 25/100 = (simplify) 1/4
12/1 * 1/4 = 12/4 = (simplify) 3/1. Take $12 - $3 =
$9 Sale Price

Answer 4

move the decimal two places to the left and multiply by the price

or .40 x 198 = 79.20 off the price

therefore the cost is 198 - 79.20 = 118.80

Some problems you can do in your head like this next one

25% is 1/4 and 1/4 of 12 is 3 and so 12- 3 = 9 cost of the t-shirts

or once again move the decimal so we have .25 x 12 = 3 and 12 - 3 = 9.

Answer 5

because the camera is 40% off, and percents are out of 100, you want to find what 60% of the camera is. in math terms, "is" means "equal to" and "of" means "multiply by"

your equation is "what is 60% of the camera?"

this translates to
? = 60/100 x 198
the 6/10 simplifying to 3/5 or 0.6 (either will work, it just depends on which you think is easier to multiply)
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$12 T-shirts, 25% off:

percents are out of 100: 100-25= 75
"what is 75% of the t-shirts?"
? = 75/100 x 12
? = 0.75 x 12 OR ? = 3/4 x 12
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it may seem pointless now, but it will make your life much easier to be able to "translate" problems like this when they get harder, or when you're given different pieces of the equation. example: if you pay $12 for a T-shirt that is 25% off, what was the original price? (25% of what number is 12? aka 25/100 x ? = 12)

Answer 6

first of all, you can not multiply straight across. you have to change the percent into a decimal.

like this 40% becomes 0.40

next you take the price, multiply it by 0.40 and you get your answer

in your example, 0.40 x $198 = 79.02. to figure out the sale price, subtract $79.02 from $198 and you get your FINAL price of $118.98.

in your second example, 25% has to be changed into 0.25 before you multiply it by 12, so it looks like this: 0.25 x 12= 3
then take $3 and subtract it from 12 to get $9.

if you want to figure out how much tax you have to add on to a price tag. take the tax percentage (here in Alberta, canada it is 6% so change 6% into a decimal, multiply it by the what the price tag says and you get the tax. then add the tax back onto the original price to get the total price.

Answer 7

first you multiply the original price times the percent off in decimal form. In order to get it into the decimal form you have to move the decimal two place to the left.

198
x .40
=79.2

Then you subtract 198- 79.2=118.80
so 118.80 is your sale price


2.

12
x0.25
=3
and you subtract 12-3= 9
so 9 is your sale price

Answer 8

take the percent number and mutiply the price
.4*198= 79.2

take the original price and subtract 79.2
198-79.2=$118.8


samething on this problem
.25*12=3
12-3=$9

Answer 9

% means divided by 100 so 40%=40/100=2/5 or .4

40% off means you pay 100%-40%=60% of the original price.
60%=.6
$198*.6=$118.80

25% off means you pay 100%-25%=75% of the original price.
75&=75/100=.75
.75*$12=$9

Answer 10

for camera:

198 x 40% = 79.2

198 - 79.20 = $118.80 = sale price
_____________________________

t-shirt

12 x 25% = 3

12 - 3 = $9 = sale price

(NOTE: 198 x 40% is the same as 198/1 x 40/100)