Answer:
(i) Suppose that \[x\] young people were surveyed. Then, the number of young people who liked classical music = 10% of \[x\] \[=x\times \frac{10}{100}\] According to the question, \[\frac{x}{10}=20\] \[\Rightarrow \] \[x=20\times 10\] \[\Rightarrow \] \[x=200\] Hence, 200 young people were surveyed. (ii) Light music is liked by the maximum number of people. (iii) Number of CD's of semi classical music = 20% of 1000 \[=1000\times \,\frac{20}{100}\,=200\] Number of CD's of classical music = 10% of 1000 \[=1000\times \,\frac{10}{100}=100\] Number of CD's of Folk music = 30% of 1000 \[=1000\times \frac{30}{100}=300\] Number of CD's of Light music = 40% of 1000 \[=1000\times \frac{40}{100}=400\].
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