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# Answer to Question #167 in Statistics and Probability for Sweety Kalra

Question #167
What are the forumulas to calculate the index number?
1. Obtain a value for the base period. For instance, the company revenue was $2,500,000 in 2005. 2. Obtain the value for another period you wish to compare to the base one. For instance, the revenue of the same company became$3,600,000 in 2008.
3. Divide the number from Step 2 by the base period value, and multiply the quotient by 100 to calculate the index number. In our example :

Index number = ($3,600,000 /$2,500,000) x 100 = 144.

Since 100 is the full amount of the base period (or 100%), subtract 100 from your answer. This indicates the revenue growth by 44 percent in comparison to the base year.

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