The SA would be 10e² because there are 10 squares.
The V would be 2e³ because there are 2 cubes.
Part A
If e = 5 cm, simply plug it into the SA formula we have already.
SA = 10e² = 10*5² = 10*25 = 250 cm².
Part B
If e = 5cm, simply plug it into the V formula we have already.
V = 2e³ = 2*5³ = 2*125 = 250 cm³.
Now we need to find what percent of 250 is 150?
250p = 150
p = 150/250 = 3/5 = 0.6 = 60%