(2 marks) [1998 PP1 No. 91 4. The charge, C shillings per person for a certain seminar is partly fixed and partly inversely proportional to the total number N of people. (a) Write down an expression for C in terms of N. (1 mark) (b) When 100 people attend the charge is sh 8,700 per person while for 35 people the charge is sh 10,000 per person. Calculate the fixed charge. (3 marks) (c) If a person had paid the full amount and does not attend, the fixed charge is refunded. A group of people paid but ten per cent of them did not attend. After the refund the organizer remained with sh 574,000. Find the number of people initially in the group. (4 marks) [2000 PP2 No. 20] CD​