Mathematics Mcqs

On decreasing the price of T.V. sets by 30 % its sale is increased by 20 %. What is the effect on the revenue received by the shopkeeper?

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On decreasing the price of T.V. sets by 30 % its sale is increased by 20 %. What is the effect on the revenue received by the shopkeeper?

A. 10 % increase
B. 10 % decrease
C. 16 % increase
D. 16 % decrease
Let price = Rs. 100, Sale = 100
Then Sale Value = Rs. (100 × 100) = Rs. 10000
New Sale Value = Rs. (70 × 120) = Rs. 8400
Decrease % = (1000/10000 x 100) % = 16 %

Water tax is increased by 20% but its consumption is decreased by 20 %. Then, the increase or decrease in the expenditure of the money is:________?

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Water tax is increased by 20% but its consumption is decreased by 20 %. Then, the increase or decrease in the expenditure of the money is:________?

A. No change
B. 5 % decrease
C. 4 % increase
D. 4 % decrease
Let tax = Rs. 100 and consumption = 100 units
Original Expenditure = Rs. (100 × 100) = Rs. 10000
New Expenditure = Rs. (120 × 80) = Rs. 9600
Decrease in expenditure = (400/10000 x 100) % = 4 %

The price of cooking oil has increased by 25 %. The percentage of reduction that a farming should effect in the use of cooking oil so as not to increase the expenditure on this account is________?

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The price of cooking oil has increased by 25 %. The percentage of reduction that a farming should effect in the use of cooking oil so as not to increase the expenditure on this account is________?

A. 15 %
B. 20 %
C. 25%
D. 30%
Reduction in consumption = [25/125 ×100] % = 20 %

In an election between two candidates, the candidate who gets 30 % of the votes polled is defeated by 15000 votes. The number of votes polled by the winning candidate is:________?

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In an election between two candidates, the candidate who gets 30 % of the votes polled is defeated by 15000 votes. The number of votes polled by the winning candidate is:________?

A. 11250
B. 15000
C. 26250
D. 37500
Explanation:
Let the votes polled by the winning candidate be x.
Then, (x – 15000) = 30 % of [x + (x – 15000)]
or x = 26250.

A student who secures 20 % marks in an examination fails by 30 marks. Another student who secures 32 % marks gets 42 marks more than those required to pass. The percentage of marks required to pass is:________?

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A student who secures 20 % marks in an examination fails by 30 marks. Another student who secures 32 % marks gets 42 marks more than those required to pass. The percentage of marks required to pass is:________?

A. 20%
B. 25 %
C. 28%
D. 30%
Explanation:
20 % of x + 30 = 32 % of x – 42
Or 12 % of x = 72.
So, x = (72 ×100)/12 = 600
Pass marks = 20 % of 600 + 30 = 150
Pass Percentage =[1/4 x 100]%= 25 %

5 % income of a is equal to 15 % income of B and 10 % income of B is equal to 20 % income of C if the income of c is Rs. 200, then total income of A, B and C is :_________?

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5 % income of a is equal to 15 % income of B and 10 % income of B is equal to 20 % income of C if the income of c is Rs. 200, then total income of A, B and C is :_________?

A. Rs. 6000
B. Rs. 18000
C. Rs. 20000
D. Rs. 14000
Explanation:
5 % A = 15 % B and 10 % B = 20 % C.
A/20 = 3B/20 and B/10 = C/5
or B = 2C. A/20 = 3/20 × 2c = 3/10
C = 3/10 × 2000 = 600
A = (600 × 20) = 12000,
B = (2 × 2000) = 4000
A + B + C = (12000 + 4000 + 2000) = 18000
Therefore, Rs. 18000/-

After spending 40 % in machinery, 25 % in the building, 15 % in raw material and 5 % on furniture, Haris had a balance of Rs. 1305. The money with him was:________?

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After spending 40 % in machinery, 25 % in the building, 15 % in raw material and 5 % on furniture, Haris had a balance of Rs. 1305. The money with him was:________?

A. Rs. 6500
B. Rs. 7225
C. Rs. 8700
D. Rs. 1390
Explanation:
x – [40 % of x + 25 % of x + 15 % of x + 5 % of x] = 1305
or x – 85 % of x = 1305
or 15 % of x = 1305 x 130500/15 × 8700
= Rs. 8700