# Quick Question re: adding percentages

• Jul 10th 2008, 07:33 AM
karmurph
Hello- first time poster...

How do I add two % together?

i.e. I have two products. One is reporting 41% of total usage. The other is reporting 32% of total usage.

How do I find what the total usage is between the two?

• Jul 10th 2008, 07:37 AM
Moo
Hello,

Quote:

Originally Posted by karmurph
Hello- first time poster...

How do I add two % together?

i.e. I have two products. One is reporting 41% of total usage. The other is reporting 32% of total usage.

How do I find what the total usage is between the two?

In general, percentages represent parts of something.

Here, the "something" is the "total usage".

Let x represent the "total usage".

You have 41%x, that is to say $\frac{41}{100} x$ and 32%x, that is to say $\frac{32}{100} x$.

So logically, the sum of the two will be $\frac{41+32}{100} x$, =73% x.

Now it depends on whether the percentages are observed for independent things... We have to see what the situation is !