what would be the formular to ADD 3.4%

[jasonc]

I have an original price column and the new price column and wish to know how to ADD 3.4% to the new column.

 

can anyone suggest the formular for this ?

[EdwinPaul]

I have an original price column and the new price column and wish to know how to ADD 3.4% to the new column.

 

can anyone suggest the formular for this ?

 

$a=150;

$b=$a*1.034;

[jasonc]

ok thank you, now how do i add 20%, and also how do i take away 20%

[cssfreakie]

ok thank you, now how do i add 20%, and also how do i take away 20%

seriously? please sue your teacher

 

x*1.2

 

x*0.8

 

 

[Zane]

.20 stands for 20 out of 100 or 20/100 or 2 tenths or 2/10.

 

This is exactly what the percentage sign is for in mathematics, to create a shorthand for x out of 100.  Now that I have explained that explain how to take something more trivial and turn it into a decimal number.  Suppose you have 47.5%.  In order to put that into a decimal number, one needs to divide by 100.. or even better, move the decimal place 2 spaces to the left.  The 2 spaces represent the 2 zeroes in 100.

 

Once you have this decimal number, which is .475, it can be used to find 47.5% of something.

 

Lemme back up even more.

1 X 1 = 1 ... right?

So we want 50% of 1, which is .5, the equation would be

1 X .5 = .5

Why? Because anything times 1 equals itself.

 

Ok, so now lets say you want to add 50% to 1.

Well, we already know that 100% of 1 is 1, so we need to know what 150% would be.  Now if you move the decimal place in that 2 times, which is at the end by the way, we get 1.5

 

Then the equation turns out to be

1 X 1.5 =  1.5

 

But since it's multiplied by 1, again, we end up with the same number.

To mix it up a little, let's say we had 75 dollars and we wanted to add 20% to it.

Since we want to ADD to the 75, we have the same dilemma as the 150% example.  Instead, this time, we're wanting 120%, because we KNOW 100% of 75 is 75

 

 

 

 

The equation would then be

75 X 1.20 = 90