A survey asked workers where they thought the most germ-contaminated spot in the workplace was.

Suppose the survey took place at a large company with 9,000 people. Use the pie chart to determine

the number of employees who would vote for each of the following as the most germ-contaminated

area.

Other

5%

Keyboards

12%

Doorknobs

15%

Restrooms

36%

Telephones

32%

How many people for keyboard?

How many people for doorknobs

How many people for restrooms and others

How many people for telephones or doorknobs

To calculate the number of employees for each category, multiply the given percentages by the total number of respondents for the survey, which is 9,000 employees.

To multiply by a percentage, first convert the percentage to a decimal by dividing it by 100. Then multiply the decimal value by the number you want to find the percentage of.

From observation of the give pie chart, the percentage of employees who voted for keyboard was 12%. Therefore:

\(\textsf{Number of people for keyboard}=12\% \times 9000\\\\\textsf{Number of people for keyboard}=0.12 \times 9000\\\\\textsf{Number of people for keyboard}=1080\)

From observation of the give pie chart, the percentage of employees who voted for doorknobs was 15%. Therefore:

\(\textsf{Number of people for doorknobs}=15\% \times 9000\\\\\textsf{Number of people for doorknobs}=0.15 \times 9000\\\\\textsf{Number of people for doorknobs}=1350\)

From observation of the give pie chart, the percentage of employees who voted for restrooms was 36%, and the percentage of employees who voted for other was 5%. Therefore:

\(\textsf{Number of people for restrooms and others}=(36\%+5\%) \times 9000\\\\\textsf{Number of people for restrooms and others}=(41\%) \times 9000\\\\\textsf{Number of people for restrooms and others}=0.41 \times 9000\\\\\textsf{Number of people for restrooms and others}=3690\)

From observation of the give pie chart, the percentage of employees who voted for telephones was 32%, and the percentage of employees who voted for doorknobs was 15%. Therefore:

\(\textsf{Number of people for telephones or doorknobs}=(32\%+15\%) \times 9000\\\\\textsf{Number of people for telephones or doorknobs}=(47\%) \times 9000\\\\\textsf{Number of people for telephones or doorknobs}=0.47 \times 9000\\\\\textsf{Number of people for telephones or doorknobs}=4230\)