Choose the word or phrase that is equivalent in meaning to the given phrase:
Fight tooth and nail
"Fight tooth and nail" is an idiom meaning to struggle with great determination and using all one's energy and resources to achieve or resist something. It is not about literally biting or scratching; it is about fighting as hard as possible.
So the phrase means to make a determined effort, option b.
If the price of a commodity increases by 25%, by what percentage should the consumption be reduced to keep the expenditure the same?