Answer:
20% or 1/5 or 0.2
Step-by-step explanation:
1. There are 10 sections, which means each section has a a chance of 10% to be landed on.
2. There are two multiples of four under 10: 4 and 8.
That means there is a 2 * 10% = 20% chance that the spinner will land on a multiple of 4.