Katutura Hospital has recorded the following in cost for carrying health checks on patients during the last three months Month January Number of Patients 550 Total cost (N$) 15 500 16 700 17 100 February March 750 950 Using the high-low method, the cost of carrying out health checks for 650 patients would be: OA. 13 300 OB. 15 500 O C. 12 300 OD 15 900 OE. None of the above