Choose the word which is antonymous to the word given in capitals.
REPINE
To repine means to fret, to complain and to feel gloomy discontent. The opposite feeling is to be glad and to express delight, which is what rejoice means.
So the antonym of REPINE is rejoice.
If the price of a commodity increases by 25%, by what percentage should the consumption be reduced to keep the expenditure the same?