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Answer :
(i) let, the number of young people surveyed =x
∴10% of x=20
\(\Rightarrow \frac { 100\times x}{ 10 } = 20 \)
\(\Rightarrow x=200\)
Thus, number of young people surveyed = 200
(ii) Light music is liked by the maximum people, i.e., 40%
(iii) Total number of CD = 1000
Number of CD’s in respect of:
classical music =\( \frac { 10\times 1000 }{ 100 } = 100\)
semi-classical music = \(\frac { 20\times 1000 }{ 100 } = 200\)
light music = \(\frac { 40\times 1000 }{ 100 } = 400\)
folk music = \(\frac { 30\times 1000 }{ 100 } = 300\)