A company studied the commuting pattern of its workers and concluded that 40% of the workers commute to work in 20 minutes, 35% in 30 minutes, 20% in 60 minutes and 5% in 90 minutes. What is the average time of commuting? Question 35 options: a) 8.75 minutes b) 25 minutes c) 50 minutes d) 35 minutes e) None of the above