Question : If the curved surface area of a cylinder is increased by 20% and height is decreased by 4%, then the net decrease or increase in the volume will be:

Option 1: 36% decrease

Option 2: 20% increase

Option 3: 50% increase

Option 4: 33% decrease

Question : If a number is increased by 25% and the resulting number is decreased by 25%, then the percentage increase or decrease finally is:

Option 1: no change

Option 2: decreased by $6\tfrac{1}{4}$%

Option 3: increased by $6\tfrac{1}{4}$%

Option 4: increased by $6$%

Question : If water is frozen to become ice, its volume is increased by 10%, then if the ice is melted to water again, its volume will be decreased by:

Option 1: $9$%

Option 2: $9\frac{1}{11}$%

Option 3: $8$%

Option 4: $9\frac{1}{2}$%

Question : If the price of a product is first increased by 15% and then decreased by 20%, then what is the percentage change in the price?

Option 1: 5% decrease

Option 2: 8% increase

Option 3: 5% increase

Option 4: 8% decrease

Question : A number is first decreased by 20%. The decreased number is then increased by 20%. The resulting number is less than the original number by 20. Then the original number is:

Option 1: 200

Option 2: 400

Option 3: 500

Option 4: 600