Hello,

In general, percentages representpartsof something.

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

Let x represent the "total usage".

You have 41%x, that is to say and 32%x, that is to say .

So logically, the sum of the two will be , =73% x.

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