if i want to add or discount 25% (for example) to the net cost of an item , what is the formula to use?

Answer 1

You find 25% of the price and either add it to the original or subtract it.

25% is the same as 1/4, so just multiply your price by 1/4.

UMRmathmajor

Answer 2

It all depends on what is the current value. fo example, if the current net cost (before any discounts etc) is £100, then you simply do this:

£100 X 25% = £25

However, if the net cost is after any discounts then you use the following formula:

{£100 X 100% } / (100 - 25) = £133.33

Now if you apply 25% to £ 133.33 you will get a discount of £33.33 to arrive at a net cost of £100

Hope this proves useful.

Answer 3

Add 25% => you need to find 125%.
So if the cost of the item is x,
then the new cost becomes 1.25x.

Discount 25% => you need to find 75%.
So if the cost of the item is x,
then the new cost becomes 0.75x.

Answer 4

Example..
20
x.25
--------
100
+400
----
5.00 ..25 % of $20 is $5...subtract 5 from 20 and the item would cost $15..

Answer 5

Let original price be X

Increase of 25% gives new price of X + (25/100) X
= X + 0.25 X = 1.25 X

Decrease of 25% gives new price of X - (25/100)X
= X - 0.25X = 0.75X

Answer 6

Convert the percentage to a decimal, then realize "of" translates to "times". So if you have something at $500 and want to take 25% off of it, that's "500 minus 25% of 500", or 500 - (0.25*500). Likewise, if you want to find out "500 plus 25% of 500", that would be 500 + (0.25*500).

Answer 7

25% is a quarter of 100% therefore you reduce the price of an item by a quarter. So, if an article is priced at £50 and you reduce it by a quarter, the new price is £37.50p

Answer 8

to add 25%...
original cost + (original cost x .25)

to discount 25%
original cost - (original cost x .25)

Answer 9

X*.75

Answer 10

if the original price is x, then 25% is 0.25x

to add: price = x + 0.25x
to discount: price = x - 0.25x