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Based on the available information, it must be the case that, in the [2nd] Quarter, Division [C's] net profit more than doubled from the prior quarter.
  • % for Division C double from 30% to 60%
  • In each of the quarters, each division had an increase in net profit compared to the prior quarter
=> surely the net profit of Division C at least doubled
 
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I didn't understand why second quarter? As net profit of a+b+c in second quarter < net profit of all tnree in third quarter
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I didn't understand why second quarter? As net profit of a+b+c in second quarter < net profit of all tnree in third quarter



The fact that total net profit in the Third Quarter is greater than in the Second Quarter does not tell us that any division’s profit more than doubled.

The reason we can identify the Second Quarter is Division B. Its share falls from 50% to 25%, yet we are told that its actual net profit increased. Therefore, the Second Quarter total must be more than twice the First Quarter total.

Since Division C’s share also rises from 30% to about 58%, Division C’s actual profit must have more than doubled.

For example, suppose the First Quarter total profit was 100. Then Division B’s profit was 50 and Division C’s profit was 30.

In the Second Quarter, B represents only 25% of the total, yet B’s actual profit increased. Therefore, 25% of the Second Quarter total must be greater than 50, so the Second Quarter total must be greater than 200.

Division C represents about 58% of that total, so C’s Second Quarter profit must be greater than 58% of 200 = 116. Since 116 is more than twice 30, Division C’s profit must have more than doubled.

Hope it's clear.
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