for example, ようだ≒look like. そうだ can show Real Fact.

あなたが 降り止む という言い方を知らないからです。

友だちになろうよ＾＾

売上 is just a benefit for a company/a shop.it is for one day,or one month,one year,for example.it is really just number per the time. but 売れ行き means the speed. for example,how fast a vegetable was sold for a term/a time. I know my explain was poor again,but please enjoy our language,Trang :)

我们可以像这样想

ありません。変です。

納める. 納める is used for paying,of course,lol. but after we enjoy drinking a cup of coffee,we don't use 納める in the coffee shop. we just say,or use,払う. however, if we need to pay a kind of tax for a city hall some,we say 納める. as you notice.the point of your topic is probably where the person here need to pay. maybe,for big powerful organizations we use 納める. and we say use 払う for the small power organizaitions like shops,daily stores,so on )

they have no differences!