Tolong jawab secepatnya ya dan pakai cara.TY

B1 = p × l × t
= (15+5+10) × 10 × 10
= 30 × 10 × 10
=3000 cm³

B2 = p × l × t
=10 × 20 × 5
=1000 cm³

= B1 + B2
= 3000 cm³ + 1000 cm³
= 4000 cm³ { C. }