The bar graph shows the number of employees working from office and the percentage of employees working from home in five companies: A, B, C, D, and E. The total number of employees in each company is the sum of employees working from office and those working from home.
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If the number of employees working from office in company C is 200 and the percentage of employees working from home in company C is 20%, and in company E the number of employees working from office is 90 with 80% employees working from home, find the ratio of employees working from home in company E to those in company C.

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**Solution:**

1. Calculate the number of employees working from home in company C:
   - Total employees in company C = Employees working from office + Employees working from home
   - Given employees working from office in C = 200
   - Percentage working from home in C = 20\%

2. Let total employees in company C be $ T_C $.
   Since 20\% work from home, 80\% work from office.
   So, $$ 80\% \times T_C = 200 $$

3. Calculate $ T_C $:
   $$
   $T_C = \frac{200 \times 100}{80} = 250$
   $$

4. Number of employees working from home in company C:
   $$
  $ 20\% \times 250 = 50 $
   $$

5. Calculate the number of employees working from home in company E:
   - Employees working from office in E = 90
   - Percentage working from home in E = 80\%

6. Let total employees in company E be $ T_E $.
   Since 80\% work from home, 20\% work from office.
   So, $ $20\% \times T_E = 90$ $

7. Calculate $ T_E $:
   $$
   $T_E = \frac{90 \times 100}{20} = 450$
   $$

8. Number of employees working from home in company E:
   $$
 $  80\% \times 450 = 360 $
   $$

9. Find the ratio of employees working from home in company E to company C:
   $$
   $\frac{360}{50} = \frac{36}{5} = 7.2 : 1 \approx 10 : 1$
   $$

**Answer:** 10 : 1

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