361. A’s salary is increased by 10% and then decreased by 10%. Then, change in salary is

1. 1. 0%

   
   
   

   2. 1% decrease

   
   
   

   3. 1% increase

   
   
   

   4. 2% decrease

   
   
   

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1. View Hint View Answer Discuss in Forum

   Here , y = 10%
   We can find the required answer with the help of given formula ,
   

   Change in salary = -	y × y	%
   	100

   
   

   Correct Option: B

   Here , y = 10%
   We can find the required answer with the help of given formula ,
   

   Change in salary = -	y × y	%
   	100

   
   

   Change in salary = -	10 × 10	= -1 %
   	100

   
   Negative sign shows decrease.

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362. A saves 20% of his monthly salary. If his monthly expenditure is ₹ 6,000, then his monthly savings is

1. 1. ₹ 1,500

   
   
   

   2. ₹ 1,800

   
   
   

   3. ₹ 1,200

   
   
   

   4. ₹ 4,800

   
   
   

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1. View Hint View Answer Discuss in Forum

   If the monthly income of A is ₹ P, then
   

   	P × 80	= 6000
   	100

   
   

   ⇒ P =	6000 × 100	= ₹ 7500
   	80

   
   

   Correct Option: A

   If the monthly income of A is ₹ P, then
   

   	P × 80	= 6000
   	100

   
   

   ⇒ P =	6000 × 100	= ₹ 7500
   	80

   
   ∴ Savings = 7500 – 6000 = ₹ 1500

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363. A man spends 40% of his monthly salary on food and one-third of the remaining on transport. If he saves ₹ 4,500 per month, which is equal to half the balance after spending on food and transport, his monthly salary is

1. 1. ₹ 11,250

   
   
   

   2. ₹ 22,500

   
   
   

   3. ₹ 25,000

   
   
   

   4. ₹ 45,000

   
   
   

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1. View Hint View Answer Discuss in Forum

   Suppose monthly income of the man is Rs. P.
   

   Expenditure on food = 40% of P = ₹	2P
   	5

   
   

   Remaining amount = P –	2P
   	5

   
   

   = ₹	3P
   	5

   
   

   Expenditure on transport =	1	×	3P
   	3		5

   
   

   = ₹	P
   	5

   
   

   Remaining amount =	3P	-	P
   	5		5

   
   

   Correct Option: B

   Suppose monthly income of the man is Rs. P.
   

   Expenditure on food = 40% of P = ₹	2P
   	5

   
   

   Remaining amount = P –	2P
   	5

   
   

   = ₹	3P
   	5

   
   

   Expenditure on transport =	1	×	3P
   	3		5

   
   

   = ₹	P
   	5

   
   

   Remaining amount =	3P	-	P
   	5		5

   
   

   =	2P
   	5

   
   

   =	1	×	2P	= 4500
   	2		5

   
   ∴ P = 4500 × 5 = ₹ 22,500Suppose monthly income of the man is Rs. x.
   Expenditure on food
   

   = 40% of x = ₹	2x
   	5

   
   

   Remaining amount = x –	2x
   	5

   
   

   = ₹	3x
   	5

   
   Expenditure on transport
   

   =	1	×	3x
   	3		5

   
   

   = ₹	x
   	5

   
   Remaining amount
   

   =	3x	-	x
   	5		5

   
   

   =	2x
   	5

   
   

   =	1	×	2x	= 4500
   	2		5

   
   ∴ x = 4500 × 5 = ₹ 22,500

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364. Nitin’s salary was reduced by 10% and then the reduced salary was increased by 10%. His new salary in comparison with his original salary is

1. 1. the same

   
   
   

   2. 1% more

   
   
   

   3. 1% less

   
   
   

   4. 5% less

   
   
   

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1. View Hint View Answer Discuss in Forum

   Let Nitin’s initial salary be 100
   After 10% reduction, New salary = 90% of 100 = ₹ 90
   Again after 10% increase ,
   

   New salary =	90 × 110	= ₹ 99
   	100

   
   

   Correct Option: C

   Let Nitin’s initial salary be 100
   After 10% reduction, New salary = 90% of 100 = ₹ 90
   Again after 10% increase ,
   

   New salary =	90 × 110	= ₹ 99
   	100

   
   ∴ Percentage decrease = 1 %

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365. A man spends 75% of his income. His income increased by 20% and he increased his expenditure by 15%. His savings will then be increased by

1. 1. 33%

   
   
   

   2. 33	1	%
      	3

   
   
   

   3. 35%

   
   
   

   4. 40%

   
   
   

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1. View Hint View Answer Discuss in Forum

   Let man’s income = ₹ 100
   Savings = 100 – 75 = ₹ 25
   New income = ₹ 120
   

   Savings = 120 -	75 × 115	= 120 -	345
   	100		4

   
   

   Savings =	480 - 345	= ₹	135
   	4		4

   
   

   Correct Option: C

   Let man’s income = ₹ 100
   Savings = 100 – 75 = ₹ 25
   New income = ₹ 120
   

   Savings = 120 -	75 × 115	= 120 -	345
   	100		4

   
   

   Savings =	480 - 345	= ₹	135
   	4		4

   
   

   Increase in savings =	135	- 25 = ₹	35
   	4		4

   
   

   ∴ Percentage increase =	35 / 4	× 100 = 35%
   	25

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