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 : The average of n numbers is 42. If 75% of the numbers are increased by 4 each and the remaining numbers are decreased by 8 each, then what is the average of the numbers, so obtained?

Option 1: 44

Option 2: 42.5

Option 3: 43

Option 4: 43.8

Question : The average of n numbers is 45. If 60% of the numbers are increased by 5 each and the remaining numbers are decreased by 10 each, then what is the average of the numbers so obtained?

Option 1: 42

Option 2: 43

Option 3: 46

Option 4: 44

Question : The length of a rectangle is increased by 10% and breadth is decreased by 10%. The area of the new rectangle is:

Option 1: neither increased nor decreased.

Option 2: increased by 1%.

Option 3: decreased by 2%.

Option 4: decreased by 1%.