The price of sugar goes up by 20%. By how much percent must a hours wife reduce her consumption so that the expenditure does not increase?

The price of petrol rose by 10%. By how consumption should be reduced so that expenditure does not increase.

The price of coffee rose by 20% following shortange in availability in the market. As a result , Carlose decided to mitigate increasing expenses by reducing his coffee intake. By what percentage should Carlos reduce his intake so that there is no effect on the expenditure on coffe ?

If the diameter of cross-section of a wire is decreased by 5% how much percent will the length be increased so that the volume remains the same?

The salary of an officer has been increased by 50%. By what percent the new salary must be reduced to restore the original salary?

Smith buys an article marked at Rs 2,200. The rate of tax is 12%. He asks the shopkeeper to reduce the price of the article to such an extent that he does not have to pay anything more than Rs 2.240 including tax. Calculate the reduction, as percent, needed in the marked price of the article.

An ideal engine whose low-temperature reservoir is at 27^@C has an efficiency of 40%. By how much should the temperature of the high-temperature reservoir be increased so as to increase the efficiency to 50% ?

A second's pendulum clock has a steel wire. The clock is calibrated at 20^@ C . How much time does the clock lose or gain in one week when the temperature is increased to 30^@ C ? alpha_(steel = 1.2 xx 10^-5(^@ C)^-1 .

A second's pendulum clock has a steel wire. The clock is calibrated at 20^@ C . How much time does the clock lose or gain in one week when the temperature is increased to 30^@ C ? alpha_(steel) = 1.2 xx 10^(-5).^@C^(-1) .

The price of an article is Rs 8,250 which includes tax at 10%. Find how much more or less does a customer pay for the article, if the tax on the article: increases to 15%

The price of an article is Rs 8,250 which includes tax at 10%. Find how much more or less does a customer pay for the article, if the tax on the article: increases by 2%