Answer:
=280
Explanation:
Step 1: 
find the surface areas of both the figures 
area of 1rst: 
length = 2 
width =4 
height = 10 
surface area formula = 2(wl+wh+hl) 
= 136 
area of second
length = 4 
width =4 
height = 7
surface area formula = 2(wl+wh+hl) = 
2·(4·4+7·4+7·4)=144
144 + 136 = 280 
I hope this helps!! :)