Answer:
10%
Explanation:
The probability that one or the other will sell out is the summation of both flights probabilities.
Probability of either selling out= 60% + 50%
Probability of either selling out= 110%
The probability that both will sell out is 100%- (Probability of one or the other selling out)
Probability of both selling out= 100-110
Probability of both selling out= 10%