20% of the employees in a company go to gym during the lunch hour. 57% of all employees in this company are male, and 12% of all employees are males who go to gym during the lunch hour.

If you choose an employee at random from this company, what is the probability that:

a)this person is a female who exercises during the lunch hour?

b)this person is a female who does NOT exercise during the lunch hour?

c)if the person is male, he exercises during the lunch break?

(steps should be performed in excel)