Calculating with javascript

[skyhighweb]

hi all i need a javascript to do this calculatioon for me

1000 + 1000 - 10% = 1900

i have this for calculation, working example

<p id="demo"></p>

<script>
var x = 1000 + 1000 - 10  ;
document.getElementById("demo").innerHTML = x;
</script>

but i cant introduce the % behind the 10 it doesnt work

[gandalf458]

That's an odd way of expressing it. I assume what you mean is:

1000 + ( 1000 * .9 )

[Rubble]

Is the % a special character and would need to be escaped?

Although I would go with using a number and multiply as per @gandalf458 example

Edit:
You could also leave out the parentheses as in this case 1000 + 1000 * .9 would work bit using the parentheses makes it easier to read.

[skyhighweb]

yes that helps, but where does the .9 comes from how does that work

[TechnoBear]

If you subtract 10% of its value from any number, what you are left with is 90% of that number. That's 90/100, which is the same as 0.9.

Multiplying your number by 0.9 is simpler than calculating 10% and subtracting it.

[skyhighweb]

oh i see thanks alot for the lecture didnt know that:slight_smile:

[gandalf458]

didnt know that

That's rather disturbing. It's pretty elementary arithmetic.

[skyhighweb]

oh yeah i was never good in maths, never really my thing gave me headaches:sweat_smile: