Answer: 60480
Step-by-step explanation:
Given : The number of empty seats in a theater = 9
The number of customers need to find places to sit =6
Since order matters here, so we use permutations
The permutations of n things taking r at a time is given by :-

Then, the number of ways to arrange 6 seat in 9 seats :-

Hence, the number of ways to arrange 6 seat in 9 seats = 60480
55/100 = (55:5)/(100:5) = 11/20
55/100 = 0.55
(x-1)^2=9 <=> x-1=3 <=> x=4