Tolong di jawab pakai caranya ya.

3. a.
JPR = 4(24+16+t)
8000 = 4(40+t)
8000 = 160 + 4t
8000/160 = 4t
50 = 4t
50/4 = t
12,5 = t
Luas permukaan balok
L = 2(pl + pt + lt)
L = 2(24.16 + 24.12,5.16.12,5)
L = 2(384 + 300 + 200)
L = 2(884)
L = 1768cm2

b.Volume
V = 24 x 16 x 12,5
V = 4.800cm3