Choose the word which is congruous to the word given in capitals.
NATTER
To "natter" means to talk casually and at length about unimportant things, that is, to chat idly. The option that means the same is "chatter".
So "chatter" is the correct synonym of NATTER.
If the price of a commodity increases by 25%, by what percentage should the consumption be reduced to keep the expenditure the same?