To dilate is to make something bigger. It says in the question that you dilate by a factor of 2, so multiply the length of the side by 2. This will get you 68.
As far as angles are concerned, angles do not change when the object is scaled bigger. So for the angle of A, the answer is still 28 degrees.
400+0.1s 400 represents how much she earns per week 0.1 represents the percentage s represents her weekly sales 0.1s represents how much of the weekly sales she gets to have.(I'm not sure if I worded the last one correctly.)
