Question: I'm commenting on several data of a graphic and I have a doubt question about the preposition that comes (or doesn't) before the percentage, and whether the determiner "the" has to appear before "times/ cases..."

Sentences:

> 
> Further, (in) 73,83% of (the) times bloody is said...  
> 
>  ... while only 26,16% of (the) cases is a child...  
> 
>  We can notice that (in) 75,6% of (the) times...
> 
> 
> 

Could you please give me some guidance?

Answer: 
Note that whether or not `the` is used doesn't depend on the % symbol. It depends on the sentence, and `the` is used as per the normal rules.

> 
> There's a piece of land we own. 90% of **the** land (we're talking about) is cultivated. [`The` **has** to be used]
> 
> 
> 65% of children play computer games. [Not `the children`, unless it is specified which children are we talking about].
> 
> 
> *Examples are from [oxford](http://www.oxforddictionaries.com/definition/learner/per-cent)*
> 
> 
> 

So to know whether or not `the` is needed, we'll require your whole sentences with context.

---

Same goes for `in`. It is included/omitted as per the normal rules. 

Compare:

* `In` is required
	+ In most of the cases, we succeeded
	+ In 70% of the cases, we succeeded
* `In` is not required
	+ We can notice that most of the times...
	+ We can notice that 20% of the times....

Don't let the mathematical symbols confuse you. As a matter of fact, you should always write `fifty percent` instead of `50%`
.
I would phrase this as follows:
Further, in 73.83% of cases, the word bloody is said, while only 26.16% of these cases...
We can see that in 75.6% of cases...