Percentage
- Two numbers are respectively 10% and 25% more than a third number. What per cent is the first of the second ?
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Using Rule 30,
If two numbers are respectively x% and y% more than a third number, the first as a per cent of second is= 100 + x × 100 = 110 × 100 = 88% 10 + y 125 Correct Option: A
Using Rule 30,
If two numbers are respectively x% and y% more than a third number, the first as a per cent of second is= 100 + x × 100 = 110 × 100 = 88% 10 + y 125
- In 2001, the price of a building was 80% of its original price. In 2002, the price was 60% of its original price. By what percent did the price decrease ?
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Original price of building = Rs. 100 (let)
∴ Its price in 2001 = Rs. 80
Its price in 2002 = Rs. 60
Required percentage decrease= 
80 - 60 
× 100 80 = 200 = 25% 8 Correct Option: C
Original price of building = Rs. 100 (let)
∴ Its price in 2001 = Rs. 80
Its price in 2002 = Rs. 60
Required percentage decrease= 80 - 60 × 100 80 = 200 = 25% 8
- In a school 70% of the students are girls. The number of boys are 510. Then the total number of students in the school is :
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Percentage of boys
= 100% – 70% = 30%
Let total no. of students be x
∴ According to question,
30% of x = 510∴ x = 510 × 100 = 1700 30 Correct Option: B
Percentage of boys
= 100% – 70% = 30%
Let total no. of students be x
∴ According to question,
30% of x = 510∴ x = 510 × 100 = 1700 30
- If 60% of the students in a school are boys and the number of girls is 972, how many boys are there in the school ?
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40% of students = 972
∴ 60% of students= 972 × 60 = 1458 40 Correct Option: B
40% of students = 972
∴ 60% of students= 972 × 60 = 1458 40
- If 70% of the students in a school are boys and the number of girls be 504, the number of boys is :
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Number of boys
= 70 × 504 = 1176 30 Correct Option: A
Number of boys
= 70 × 504 = 1176 30
