What is the surface area of this design? ?

440

Step-by-step explanation:

5 * 5 = 25

8 * 5 = 40

40 * 4 = 160

160 + 25 = 185

10 * 10 = 100

100 - 25 = 75

10 * 2 = 20

20 * 4 = 80

75 + 100 + 80 + 185 = 440

Answer is D.

Step-by-step explanation:

I don't know how to really explain it but all i did was just input option A and D.

And 3.5 is the one that came out to 84.

84=4*6*3.5

Sorry i can't explain it but hope this helps!!