Answer:
Formula
Volume of a rectangular prism = width × length × height
Bottom Tier
volume = 12 × 18 × 8
= 1,728 cm³
Middle Tier
volume = 8 × 12 × 6
= 576 cm³
Top Tier
volume = 4 × 4 × 4
= 64 cm³
Entire Cake
Volume = bottom tier + middle tier + top tier
= 1728 + 576 + 64
= 2,368 cm³