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I understand the explanation for the question and the diagramming that led to the answer. However, I still am confused with the first line of the stimulus: "Because of the recent transformation of the market". Using the lesson on for/since/because being followed by a premise, that was my assumption and how I attempted the problem the first time around.
None of the explanations use that first sentence at all though. They just use
/10% --> B
and
10% --> 20%
Why is the because in line 1 not used as per the for/since/because lesson?