Question : If the price of petrol is increased by 28%, by what percentage should the consumption be decreased by the consumer if the expenditure on petrol remains unchanged? (Correct to 2 decimal places)

Option 1: 12.35%

Option 2: 21.88%

Option 3: 20.25%

Option 4: 25.75%

Question : If the price of petrol increased by 7%, then by what percentage should the consumption be decreased by the consumer, if the expenditure on petrol remains unchanged?

Option 1: $6 \frac{58}{107} \%$

Option 2: $5 \frac{11}{107} \%$

Option 3: $3 \frac{49}{107} \%$

Option 4: $4 \frac{99}{107} \%$

Question : If the radius of a right circular cylinder open at both ends is decreased by 25% and the height of the cylinder is increased by 25%, the curved surface area of the cylinder thus formed:

Option 1: remains unaltered

Option 2: is increased by $25\%$

Option 3: is increased by $6.25\%$

Option 4: is decreased by $6.25\%$

Question : If the price of salt decreases by 20%, then by what percentage should consumption be increased to keep the expenditure same?

Option 1: 26%

Option 2: 27%

Option 3: 25%

Option 4: 24%

Question : If the cost price is 72% of the selling price, then what is the percentage of profit?
(Correct to 2 decimal places)

Option 1: 38.89%

Option 2: 35.75%

Option 3: 32.25%

Option 4: 28.75%