Surface Area/Volume Problem: did i do it correctly?

Please check to see if i did this right. Thanks a trillion!

A wooden shed in the shape os a rectangular prism with base length and width of 8' and 6' has a hieght of 10'. The shed is resting on the ground.

a)What is the surface area of the shed that can be painted?

SA=ph+2B (but you cant paint the part resting on the ground)

SA=ph+B

SA=300+48

SA=348ft can be painted (is this squared? i dont think soo....)

b) How many boxes with a volume of 6ft^3 can be stored in the shed?

V=Bh

V=48x10

V=480ft^3

480/6

80 boxes with the volume of 6ft^3 can be stored in the shed