How can i show only 30% of the “the_content(“More…”)”?

Go with the_excerpt.

It does what it is supposed to do. Give you an excerpt of your post.

Traditionally, it is set to display the first 55 words of your post. You can tweak it using filters to give more (or less) if needed to be.

http://codex.wordpress.org/Function_Reference/the_excerpt

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