GMAT Data Sufficiency (DS) | Re: A shopkeeper purchased two TV sets A and B at the same price

Hey Mike- thank you so much for the response . I am actually subscribed to Magoosh and took question banks from Kaplan to supplement my practice sessions. I felt the same when i was attempting this question. I had orignally marked the answer A, I took out both the scenarios as the equation has a mod, then applied a discount on the value of q. I noticed that in both the cases, it fell short of the value of set A. But the answer