Answer:
But here's a good rule of thumb: if you're reading a book and you find the author using language or narrative structure in an unusual way, there's probably a literary device at work.
...
Here are 10 of the most common literary devices:
Simile.
Metaphor.
Imagery.
Symbolism.
Flashbacks.
Foreshadowing.
Motif.
Allegory.
Explanation:
0.4 and 40% percent are the same thing but if you want a specific one I'd go for 40%
