Surface area & volume. HELP please I don’t know how to do this I need the steps if possible :(

Answer:
Surface Area is 78 un.
Volume is 40 un³.
Step-by-step explanation:
A = 2(wl + hl + hw)
2 · (4 · 5 + 2 · 5 + 2 · 4)
2 · 38
76
V = whl
4 · 2 · 5
40 un³