Don't worry: native speakers don't agree on prepositions, either. Some say in/on an elevator; some say in/on a chair; and in California, you stand IN line, but in New York you stand ON line. Furthermore, there are some differences between American and British English.
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victorycountrythe problem is when it comes to write.
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I see sentences which I think have very much the same meaning.
e.g.
It is mostly an increase of Net Income. It basically illustrates an increase in profits and can sometimes can illustrate a decrease on expenses or a combination in bothIf you're writing, just use "increase in" and "decrease in". I