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lf = lebar foto = 20
lk =lebar karton = 20 + 2+ 2 = 24
tk =tinngi karton ?
tf / tk = lf / lk
30/y = 20/24
20y = 720
y = 720 /20
y = 36 cm
lebar bagian bawah
leba = 36 - 2 - 30
= 4 cm