Find the lateral area and the total area of the prism.

27 sq. ft.
36 sq. ft.
54 sq. ft.

We have that

1) the lateral area>  L=P*h
P=(3+3+3)   h=6
L=(3+3+3)*6=54 in²

the answer part 1) is the lateral area is 54 in²

2) the total area= > S=P*h+2B
2B=2*[3*3/2]     P*h=54

S=2*[3*3/2]+54=63 in²

the answer part 2) is the total area is 63 in²

8,400-6,400=xx/6,400anyways the percent increase is 31.25% or 0.3125 you can round if you can