How many plots a short story should have?

It relies in the Writer strategy method, and the  one general plot is enough or two to be twisted.

First of all Story does not have plots,, It should have Meaningful paragraphs....

It doesn't matter how many plots the story has.One plot is very enough especially if the writer was creative and knew how to twisted.

If one plot can have different stories, would a story not have more than one!

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Usually, short stories have just one plot, but if required they may have sub-plots that finally add up to the dominant plot. Three unities - of time, place and action - are followed, in general, here, though modern and postmodern writers differ with the Aristotelian principle and they tend to weave sub-plots. 

The short story is very simple so I think it should have just one plot for the reader to have fun during reading.

usually one plot which is the main one but u can have like secondary one or plot twist    

Again, a funny question. It depends on a writer how many it can contain