20% - a number?

Question

i am at college working on a program but i am stumpted on taking 20% from a number can someone please write out the formula please, thanks rick

Answer 1

Do you want to reduce a number by 20%?

If so, in subtracting 20%, what you are doing is finding 80% of the original number.

So...

...on a calculator, multiply by 0.8 (not 0.2 - multiplying by 0.2 will subtract 80% from the original)

...on paper, divide by 5 and multiply the answer you get by 4.
...or divide by 5, take a note of the answer, and subtract that number from the original.

Expressing each of these methods as a 'formula', we get:

0.8n
4(n/5)
n - (n/5)

Each of these returns the same answer

Answer 2

suppose x is the number .formula =20/100 multiplied to x

Answer 3

The number multiplied by .20 (20%)

Answer 4

I guess a "formula" would look something like this
y=.2x ( this will yield 20% of a number)

if you need the final result of a reduction of 20% you could have:
y=.8x (this gives you the number less 20%)

if you need to add 20% you could have:
y=1.20x (this will give you the number plus 20% of it)

Hope this helps!

Answer 5

1/5

Answer 6

Divide the number by 5 then subtract your finding from the original.

Answer 7

find 20 % first.
number/20x100=20%

Answer 8

100%-80%=20%

n - (n * 0.8) = 20%

Answer 9

A = X - 0.2 X
A = 0.8 X

Answer 10

do 10% and double it....300,,,,10%=30X2=60