tolong bantuin saya ngerjain soal ini ?

a = 5cm × 600 = 3000cm = 30m
b = 7cm × 600 = 4200cm = 42m
t = 4cm × 600 = 2400cm = 24m
Luas Rumah Pak Beny :
A = ½(a+b) × t
A = ½(30+42)m × 24m
A = 72m × 12m
A = 864m²