reason的形容詞形式是什麼

例句：

You get a good meal for a reasonable price.

你能以公道的價格好好地吃一頓。

We sell good quality food at reasonable prices.

我們以公道的`價格出售優質食品。

Public spending must be kept within reasonable bounds.

公共開支必須控制在合理的範圍內。