Question

A survey was made to find the type of music that a certain group of young people liked in a city. Adjoining pie chart shows the findings of this survey. From this pie chart answer the following:
(i) If 20 people liked classical music, how many young people were surveyed?
(ii) If a cassette company were to make 1000 CD’s, how many of each type would they make?

Answer 1

(i) According to the question, $10\%$ represents $20$ people.
Therefore total number of people surveyed will be represented by $100\%$, and
$100\%$ represents => $\frac{100\times 20}{10}=200$ people.
Hence, $200$ People were surveyed.

(ii) CD’s of classical music is $10\%$ of $1000$ which equals $\frac{10\times 1000}{100}=100$ CD's

CD’s of semi-classical music is $20\%$ of $1000$ which equals $\frac{20\times 1000}{100}=200$ CD's

CD’s of light music is $40\%$ of $1000$ which equals $\frac{40\times 1000}{100}=400$ CD's

CD’s of folk music is $30\%$ of $1000$ which equals $\frac{30\times 1000}{100}=300$ CD's