Question : A student's marks were wrongly entered as 65 instead of 45. Due to this, the average marks for the class got increased by $\frac{1}{3}$. The number of students in the class is:

Option 1: 40

Option 2: 20

Option 3: 60

Option 4: 30

Question : From 1980 to 1990, the population of the country increased by 20%. From 1990 to 2000, the population of the country increased by 20%. Over 2000-2010, the population of the country increased by 20%. Then, the overall increased population (in percentage) of the country from 1980 to 2010 was:

Option 1: 72.2%

Option 2: 60%

Option 3: 72.8%

Option 4: 62.8%

Question : A man spends 60% of his income on different items. His income has increased by 20% and his expenditure has also increased by 10%. Find the percentage increase in his savings.

Option 1: 10%

Option 2: 15%

Option 3: 20%

Option 4: 35%

Question : The ratio of expenditure to savings of a woman is 5 : 1. If her income and expenditure are increased by 10% and 20%, respectively, then find the percentage change in her savings.

Option 1: 55%

Option 2: 60%

Option 3: 50%

Option 4: 40%

Question : The average mark obtained by a class of 60 students is 65. The average marks of half of the students were found to be 85. The average marks of the remaining students are:

Option 1: 35

Option 2: 45

Option 3: 55

Option 4: 65