Question

a) 37% b) 60% c) 75% d) None of these
The radius of a circle is increased by 1%. What is the increased per cent in its area
a) 1%
b) 1.1%
c) 2%
d) None of these
The ratio of the number of boys and girls in a school is 3: 2. 20% of the boys and
holders. The percentage of the school students who are not scholarship holders is -
a) 78%
b) 77% c) 55% d) 79%
The length of a rectangle is halved while its breadth is tripled. What is the percenta
a) 50% increase b) 50% decrease
c) 25% increase​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

since the area of circle depends only on its radius which is in the squared form i.e. πr^2 so the increment will happen two times.

lets take initial area of circle = 100 unit

after two further increment area will be = 100×101÷100×101÷100= 102.01 unit

% change in area = (102.01–100)÷100×100

= 2.01%

or u can use simple formula

x+y+xy/100 take variable positive in case of increment and negative in case of decreament.

1+1+(1*1)/100=2.01%