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Statement 1: Let the revenue from consumer products be 10000 and machine products be 9000 in 2014. And K = 10%
Consumer products 10% increase= 10000+1000=11000 and machine product 10% decrease= 9000-900=8100
So total revenue for 2015 is 19100 which is overall increase in revenue from 2014. So statement 1 is alone sufficient.
Statement 2: we don't know whether there is an increase and decrease in overall revenue or any of that so K=8 is not sufficient. So OA is A.

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Video solution from Quant Reasoning starts at 9:46
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Why successive percentage formala wont help in getting the percentage change..? As we have value of k. We can easily get the net increase or decrease percentage through successsive percentage change formula..?
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Company X has exactly two product lines and no other sources of revenue. If the consumer product line experiences a k% increase in revenue (where k is a positive integer) in 2015 from 2014 levels and the machine parts line experiences a k% decrease in revenue in 2015 from 2014 levels, did Company X’s overall revenue increase or decrease in 2015 ?


(1) In 2014, the consumer products line generated more revenue than the machine parts line.

(2) k = 8

Why successive percentage formala wont help in getting the percentage change..? As we have value of k. We can easily get the net increase or decrease percentage through successsive percentage change formula..?

The successive percentage formula works when a single quantity is first increased and then decreased, or vice versa.

But in this question, the increase and decrease apply to two separate revenue streams - not the same quantity - so the formula doesn’t apply.
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