Here's how you do this:
a.
1) Find the area of the base ((8×5)-(2×2)=36)
2) To find the surface area of prism, add the base area and the sides together, then multiply that by 5 (5×(36+5+8+5+3+2+2+2+3)=330).
3) Multiply the base by 5 to find the volume of the prism (5×36=180).
The answers are: surface area=330cm^2 and volume=180cm^3.
b.
(Do the same steps as a, but multiply by 10 instead of 5 for the surface area and volume)
The answers are: surface area=660cm^2 and volume=360cm^3.
c.
When the height doubled, the surface area and volume increased by 100%.