Answer: 0.2
Explanation:
Since the total of the 2 sweets is 1.0, we can subtract to find the probability of orange.
1.0-0.8=0.2
Another way to understand this is that the entire bag is 100% sweets. Since we know that 80% sweets are strawberry flavour, we know that we can subtract 100 and 80 to get 20% orange. That makes 0.2.