Answer:
592
Explanation:
The formula for surface area is:
L x H x 2 = answer 1
W x H x 2 = answer 2
L x W x 2 = answer 3
then...
answer 1
+
answer 2
+
answer 3
---------------------
final answer
so for your question:
12 x 8 x 2 = 192
10 x 8 x 2 = 160
12 x 10 x 2 = 240
---------------------------------
192 + 160 + 240 = 592