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number of firms 121 to $20 million o more

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A study of 276 advertising firms revealed their income after taxes

Income after taxes                     Number of firms

under $1 million                             103

$1 million to $20 million                 52

$20 million or more              

Mar 8th, 2015

If the question is how many firms have income over $20m, then you can calculate this by 276 - 103 - 52 = 121

This is because the three options are mutually exclusive - each advertising firm must fall in exactly one category (no more, no less) and so the total number across all the categories must equal the number of firms surveyed.

Mar 8th, 2015

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