The price of wheat has increased by `25 %.` Find the reduction in consumption so that there is no change in the expenditure.

The price of sugar is decreased by 10%. By what percent can a person increase the consumption so that there is no change in the expenditure?

Every month a man consumes 25 kg rice and 9 kg wheat. The price of rice is 20% of the price of wheat and thus he spends total Rs. 350 on the rice and wheat per month. If the price of wheat is increased by 20% then what is the percentage reduction of rice consumption for the same expenditure of Rs. 350? Given that the price of rice and consumption of wheat is constant?