A transport service company is running five buses between two towns which are 50 km. apart. Seating capacity of each bus is 50 passengers. The following particulars were obtained from their books for April, 2011 : Rs. Wages of drivers, conductors and cleaners 24,000 Salaries of office staff 10,000 Diesel oil and other oil 35,000 Repairs and maintenance 8,000 Taxation, insurance etc. 16,000 Depreciation 26,000 Interest and other expenses 20,000 1,39,000 Actually, passengers carried were 75% of seating capacity. All buses run on all days of the month. Each bus made one round trip per day. Find out the cost per passenger-kilometre