Hi if anyone can me with 2b and 2c. if my answer for 2a is wrong tell me what i did wrong

Issof claims that the scale factor is 1/2. which statement about his claim is correct

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

If w = 6 units, x = 3 units, and y = 5 units, what is the surface area of the figure? 168 units2 240 units2 144 units2 96 units2