Let X be the number of times the employee is not fined, so X is a random variable binomially distributed like this:

where 7 is the number of times the "experiment" is repeated, i.e. the number of time the employee parks irregularly and 0.78 is the probability that the driver is not fined (1-0.22).

We want the probability that he is not fined 7 times so we are looking for P(X=7).

Alternatively just understand that if the employee parks 7 times with probability 0.78 of not getting fined you can work out the total probability by simply calculating .