To solve the given question, we need to identify the correct grammatical form in the context of subject-verb agreement. The key here is to recognize the subject of the sentence and match it with the correct verb.
Conclusion: In subject-verb agreement, ensure that the verb corresponds to the main subject of the sentence. For phrases like "a body of," "a group of," etc., the noun determining the verb form is the one before "of."
If the price of a commodity increases by 25%, by what percentage should the consumption be reduced to keep the expenditure the same?