Step 1: Identify the pattern.
The series alternates between division and multiplication:
- \( 8 \div 2 = 4 \)
- \( 4 \times 1 = 4 \)
- \( 4 \times 1.5 = 6 \)
- \( 6 \times 2 = 12 \)
Following this pattern, we multiply 12 by 2.5:
\[
12 \times 2.5 = 30
\]
Final Answer: \[ \boxed{30} \]


