• 費用ひよう — cost, expense
• 会費かいひ — membership fee
• 学費がくひ — school expenses
• 生活費せいかつひ — living expenses
• 交通費こうつうひ — transportation expenses

費 is made up of the radical 貝 (money/shell) and the sound component 弗 (ヒ). It originally meant “to lose money or value,” which evolved into the modern meaning of “to spend” or “cost.” You'll often find this kanji in contexts where money or effort is being used up.

旅行費りょこうひが 高たかすぎます。
The travel cost is too high.

生活費せいかつひを 節約せつやくしています。
I’m trying to save on living expenses.

The on-yomi ヒ (hi) is dominant and appears in nearly all compound words. The kun-yomi ついやす and ついえる are used in native-style expressions meaning “to spend” or “to be exhausted.”