391. The income of C is 20% more than B’s and the income of B is 25% more than A’s. Find by how much per cent is C’s income more than A’s ?

1. 1. 150%

   
   
   

   2. 50%

   
   
   

   3. 25%

   
   
   

   4. 35%

   
   
   

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1. View Hint View Answer Discuss in Forum

   Suppose income of A = 100
   ∴ Income of B = 125
   Income of C = 150
   

   ∴ Required percentage =	( Income of C - Income of A ) × 100	%
   	Income of A

   Correct Option: B

   Suppose income of A = 100
   ∴ Income of B = 125
   Income of C = 150
   

   ∴ Required percentage =	( Income of C - Income of A ) × 100	%
   	Income of A

   
   

   ∴ Required percentage =	50 × 100	= 50%
   	100

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392. A person who spends 66	2	of
     	3

     
     his income is able to save ₹1,200 per month. His monthly expenses (in ₹) is :

1. 1. 1,200

   
   
   

   2. 2,400

   
   
   

   3. 3,000

   
   
   

   4. 3,200

   
   
   

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1. View Hint View Answer Discuss in Forum

   According to question ,
   

   Savings = 100% - 66	2	%
   	3

   
   

   = 33	1	%
   	3

   
   

   ∴ 33	1	% = ₹ 1200
   	3

   
   

   ∴ 100% =	1200	× 3 × 100 = ₹ 3600
   	100

   
   ∴ Expenses = Total income - savings
   Expenses = 3600 – 1200 = ₹ 2400
   We can find the required answer with the help of given formula ,
   Here, R = ₹ 1200
   

   A = 66	2	%
   	3

   
   

   Correct Option: B

   According to question ,
   

   Savings = 100% - 66	2	%
   	3

   
   

   = 33	1	%
   	3

   
   

   ∴ 33	1	% = ₹ 1200
   	3

   
   

   ∴ 100% =	1200	× 3 × 100 = ₹ 3600
   	100

   
   ∴ Expenses = Total income - savings
   Expenses = 3600 – 1200 = ₹ 2400
   We can find the required answer with the help of given formula ,
   Here, R = ₹ 1200
   

   A = 66	2	%
   	3

   
   Now ,
   

   Monthly income =	100		× 1200
   	100 - 66	2
   		3

   
   

   Monthly income =	100		× 1200
   	100 -	200
   		3

   
   

   Monthly income =	300	× 1200 = ₹ 3600
   	100

   
   Expenses = Income – savings = 3600 – 1200 = ₹ 2400

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393. x is 5 times longer than y. The percentage by which y is less than x is :

1. 1. 50%

   
   
   

   2. 40%

   
   
   

   3. 80%

   
   
   

   4. 70%

   
   
   

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1. View Hint View Answer Discuss in Forum

   Length of Y = 1 foot
   ∴ Length of X = 5 feet
   

   Required percent =			5 - 1			× 100
   			5

   Correct Option: C

   Length of Y = 1 foot
   ∴ Length of X = 5 feet
   

   Required percent =			5 - 1			× 100 = 80%
   			5

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394. The percentage change in a number when it is first decreased by 10% and then increased by 10% is

1. 1. 0.1 % increase

   
   
   

   2. 1 % decrease

   
   
   

   3. 0.1 % decrease

   
   
   

   4. No changes

   
   
   

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1. View Hint View Answer Discuss in Forum

   Here , y = 10%
   Using the given formula ,
   

   Required percent = -	y2	%
   	100

   
   

   Correct Option: B

   Here , y = 10%
   Using the given formula ,
   

   Required percent = -	y2	%
   	100

   
   

   Required percent = -	10 × 10	= –1%
   	100

   
   Negative sign shows decrease.

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395. If the salary of Manoj is 40% less than that of Subhash, then by how much percentage is the salary of Subhash more than that of Manoj?

1. 1. 60%

   
   
   

   2. 66	1	%
      	4

   
   
   

   3. 66	2	%
      	3

   
   
   

   4. 65%

   
   
   

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1. View Hint View Answer Discuss in Forum

   Here , A = 40%
   

   Required percent =	40	× 100
   	100 - 40

   
   

   Required percent =	40 × 100
   	60

   
   

   Correct Option: C

   Here , A = 40%
   

   Required percent =	40	× 100
   	100 - 40

   
   

   Required percent =	40 × 100
   	60

   
   

   Required percent =	200	= 66	2	%
   	3		3

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